1 At one time we had about eighty people here who did nothing but ____ into his family history.A.reaearcjed B.to resesch C.researching D.research2 There is someone knocking at the door.Who could ____ be?I have no idea.A.he B.it C.she D.that3 Nobody__

1 At one time we had about eighty people here who did nothing but ____ into his family history.A.reaearcjed B.to resesch C.researching D.research2 There is someone knocking at the door.Who could ____ be?I have no idea.A.he B.it C.she D.that3 Nobody__
1 At one time we had about eighty people here who did nothing but ____ into his family history.
A.reaearcjed B.to resesch C.researching D.research
2 There is someone knocking at the door.Who could ____ be?
I have no idea.
A.he B.it C.she D.that
3 Nobody____any more tay,the meeting was considered closed.
A.have B.has C.having D.had

1 At one time we had about eighty people here who did nothing but ____ into his family history.A.reaearcjed B.to resesch C.researching D.research2 There is someone knocking at the door.Who could ____ be?I have no idea.A.he B.it C.she D.that3 Nobody__
1选D
解析：but做介词(except的用法也基本相同),有时后接带to的动词不定式,有时后接不带to的动词不定式.
当句子中有do时,but后面跟的动词不定式通常不用to,其基本结构是：
do nothing (anything) but do……；have……to do but do.否则,不定式符号to不能省略.如：
The enemy could do nothing but surrender.
敌人毫无办法,只得投降.
There is nothing left to him but to hit back.
他只能回击,别无他法.
除了什么只能做什么.
I can do nothing but do the homework.
无可选择不得不做什么.
He had no choice but to join the party.
除了做什么没事可做.
She had nothing to do but go on working
2选B
当有人敲门,你不知道此人是谁或者不知道他是男性还是女性,此时可用it来指代此人.故选B
3选C
后面的句子是主句,前面的那个句子是从句.主句主语是the meeting,而从句不是.故ABD放进去后nobody变成了主语,一个句子不能有2个不同的主语.所以选C.
希望我的答案对你有用,好好学习

1.选D。
nothing but 前有do的形式did，所以后接不带to的不定式，所以这里选动词原形research。
2.选B。
心目中猜想的人，用it代替。
3.选C.Nobody having any more to say是独立主格结构做状语。
根据标点符号逗号和没有连词说明前后不能是并列句。所以排除ABD这些谓语动词。
祝你学习愉快~...

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1.选D。
nothing but 前有do的形式did，所以后接不带to的不定式，所以这里选动词原形research。
2.选B。
心目中猜想的人，用it代替。
3.选C.Nobody having any more to say是独立主格结构做状语。
根据标点符号逗号和没有连词说明前后不能是并列句。所以排除ABD这些谓语动词。
祝你学习愉快~

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1C but固定句型用doing
2B 不确定用it指示代词
3B nobody用单数has

1. D. do nothing but 后面需要加动词原形。在but表示“除了......以外”的意思时，只要前面出现do , 无论是do的任何形式，but后只能用动词原形，如：I have done everything you wanted but make the beds. He does everything jin the house but put the children to...

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1. D. do nothing but 后面需要加动词原形。在but表示“除了......以外”的意思时，只要前面出现do , 无论是do的任何形式，but后只能用动词原形，如：I have done everything you wanted but make the beds. He does everything jin the house but put the children to bed.
2. B 用it指代心目中所指的人
3. C 英语中不能用逗号连接两个完整的句子，所以B不可选。选择C，句子的前半部分是一个独立主格结构，nobody 与have之间是主谓关系，所以要用have的现在分词。
P S：以后提问的时候，请把问题写准确。你看，最后一题是：any more to say,
让我们一同进步！

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1D do nothing but do sth.固定搭配
2B

d
b
c