==有点蒙 It's a long tme since i hace met him.we've never been to an amusement ago.这个忘记了完成时中的过去 ==I didn't finish to write my composition because i ran out of time They have been discussing the probelm for two and half hour

==有点蒙 It's a long tme since i hace met him.we've never been to an amusement ago.这个忘记了完成时中的过去 ==I didn't finish to write my composition because i ran out of time They have been discussing the probelm for two and half hour
==
有点蒙
It's a long tme since i hace met him.
we've never been to an amusement ago.这个忘记了完成时中的过去 ==
I didn't finish to write my composition because i ran out of time
They have been discussing the probelm for two and half hours.
A policeman stopped the thief when he wanted to run after.
The number of students in our class are fifty.
Nobody but Jim and Tom were in the room yesterday.
The police is looking for the lost child.
单选
Two months _______ quiet a long time.
Yes,i'm afraid that he will miss a lot of his lessons.
A.is B.are C.was D.were
On every piece of paper _______pictures of some horses.
A.is B.are C.has D.have
Class one ________all out when the door opened.
A.are B.is C,were D.was
The rich ______ always happy
A.aren't B.isn't C.doesn't D.don't
Our knowledge of the computers ___ growing all the time.
A.be b.is c.are d.were
能说明一下单选为什么吗

==有点蒙 It's a long tme since i hace met him.we've never been to an amusement ago.这个忘记了完成时中的过去 ==I didn't finish to write my composition because i ran out of time They have been discussing the probelm for two and half hour
改错题
1.It's a long time since i met him.(since后面不接完成时）
2.we've never been to an amusement before.(ago不和完成时搭配）
3.I didn't finish writing my composition because i ran out of time
（finish+doing）
4.They have been discussing the probelm for two and a half hours.
（记住是2个半小时是two and a half,不是two and half）
5.A policeman stopped the thief when he wanted to run away.
（run after是追赶的意思,意思和句子完全不符合）
6.The number of students in our class is fifty.（The number是主语,不是students,而数字是单数）
7.Nobody but Jim and Tom was in the room yesterday.(就近原则）
8.The police are looking for the lost child.
单选：
1.A；Two months作为一个整体,而且后面的a long time也说明应该用单数形式.
2.B；这是个倒装句,把它看成pictures of some horses are on every piece of paper.
3.C；从all可以看出是pl,而且,Class one在指一班同学时也是复数（我原来好像选错了）
4.A；The rich是指富人集体名词.
5.B；knowledge不可数,单数

It's a long time since I met him.
We've never been to an amusement
.
I didn't finish wreting my composition because I ran out of time.
They have been discussing the probelmfor two hou...

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It's a long time since I met him.
We've never been to an amusement
.
I didn't finish wreting my composition because I ran out of time.
They have been discussing the probelmfor two hours and a half.
/
The number of students in our class is fifty.
Exept Jim and Tomwere in the room yesterday.
The ploce are looking for the lost child.
A. D. C. C. B.

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It's a long tme since i met him(SINCE后接句子则用过去时）
we've never been to an amusement 。（本句ago和完成时矛盾，根据句意取完成时）
I didn't finish writing my composition because i ran out of time
（finish后加分词形式）<...

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It's a long tme since i met him(SINCE后接句子则用过去时）
we've never been to an amusement 。（本句ago和完成时矛盾，根据句意取完成时）
I didn't finish writing my composition because i ran out of time
（finish后加分词形式）
They have been discussing the probelm for two and a half hours（两个半小时表达有问题）
A policeman stopped the thief when he wanted to run away.（改run away，词组搭配不当）
The number of students in our class is fifty.（把数字加of加名词的看做单数）
Nobody but Jim and Tom was in the room yesterday（这样的句式和with一样，不管后面有多少人，都是单数）
The police are looking for the lost child.（通常把police看做复数）
A(同改错倒数第三句）
B(不确定，应该是）
C(这里是讲一班的同学们都出去了，所以用复数，再结合后面的过去时）
A（指富足的人群，故用复数，再根据后面是形容词，故加个动词）
B（知识不可数，只看of前面，故用单数）

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since I met him.