1.It was not until December 31 __________ we heard from him.A.which B.when C.that D.then2.At one time we had about eighty people here who did nothing but __________into various family history.A.researched B.research C.researching D.to research3.— H

1.It was not until December 31 __________ we heard from him.A.which B.when C.that D.then2.At one time we had about eighty people here who did nothing but __________into various family history.A.researched B.research C.researching D.to research3.— H
1.It was not until December 31 __________ we heard from him.
A.which B.when C.that D.then
2.At one time we had about eighty people here who did nothing but __________into various family history.
A.researched B.research C.researching D.to research
3.— How __________ will you be able to come back from you travel?
— In a couple of weeks,perhaps.
A.fast B.long C.often
4.Your hair needs __________.You’d better have it done tomorrow.
A.cut B.cutting C.to cut D.being cut
D.soon
5.When __________ to dinner at the White Rose Restaurant,he seemed very happy and accepted the invitation.
A.invited B.inviting C.to be invited D.having invited

1.It was not until December 31 __________ we heard from him.A.which B.when C.that D.then2.At one time we had about eighty people here who did nothing but __________into various family history.A.researched B.research C.researching D.to research3.— H
1强调句.it was that
2nothing but do sth
3根据下面的回答可以知道对方是问去多久,所以要用How long ,How often是问多经常.一般回答是每隔多久才去一次How fast是问速度的
4 cut 可表被动态,need to be done /need doing 表被动你的头发需要把被怎样~故选B便可
5还原句子是When he having invited to dinner at the White Rose Restaurant,he seemed very happy and accepted the invitation.
主语是he所以是正在被邀请故选having invited 便可

C 强调句。 IT IS THAT
A 过去式。与DID并列
B OFTEN 是讲速率，有多频繁，FAST适用于文火车汽车的速度
C need to be done 或 need doing 表示被动，显而易见C
A 他被邀请，所以是被动，AC里面 选A，因为C表示他将要被邀请

1、C
强调句
2、B
nothing but do sth 也是词组的固定用法
这里有两个例子，试比较：
The enemy can do nothing but surrender敌人除了投降之外，别无出路
The enemy had nothing to choose but to surrender
3、B
how lo...

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1、C
强调句
2、B
nothing but do sth 也是词组的固定用法
这里有两个例子，试比较：
The enemy can do nothing but surrender敌人除了投降之外，别无出路
The enemy had nothing to choose but to surrender
3、B
how long是对时间的长短提问，而how often是对事件的频率提问
4、B
need在这里作为实义动词，有三种用法：
人＋need ＋to do
物＋need ＋doing
物＋need ＋to be done
5、D
having done是指现在分词的完成形式作状语,表示这动作在谓语所表示的动作之前发生。

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1，c.是强调句型啊
2，b.前面有个助动词（did）,后面就用原型
3，a.如果选how long, 回答的应该是一个短时间，而不是一个表示时间的介词短语。如果是how often，回答的应该是表示频率的词，所以，，，
4，b.need doing =need to be done
5,a,此句前后主语一致，所以，从句中省略主谓，选INVITED
给我分吧...

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1，c.是强调句型啊
2，b.前面有个助动词（did）,后面就用原型
3，a.如果选how long, 回答的应该是一个短时间，而不是一个表示时间的介词短语。如果是how often，回答的应该是表示频率的词，所以，，，
4，b.need doing =need to be done
5,a,此句前后主语一致，所以，从句中省略主谓，选INVITED
给我分吧，打字也很辛苦的，，，

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c 1. it is not until ...that 固定搭配 直到...才
b 2. do nothing but do 固定搭配
can do nothing but do
have no choice but to do
have nothing to do but do
前面有do后面不加to
b 3.how ...

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c 1. it is not until ...that 固定搭配 直到...才
b 2. do nothing but do 固定搭配
can do nothing but do
have no choice but to do
have nothing to do but do
前面有do后面不加to
b 3.how long是指多长时间
how often是指频率
很显然，问题问的是时间
b 4.need + doing = need to be done
have是使役动词,have sb do/have sth done
a 5. 被邀请，
when (he was) invited to.....,he ....

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