Do they live here?no,but they __.A,used to B.used to do 正确答案为A,为何B不行?

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Do they live here?no,but they __.A,used to B.used to do 正确答案为A,为何B不行?
Do they live here?no,but they __.A,used to B.used to do 正确答案为A,为何B不行?

Do they live here?no,but they __.A,used to B.used to do 正确答案为A,为何B不行?
您好,选A
这里涉及到动词省略的情况
1)当原句中的主要动词为do（did）时,在后文中可省略到do（did）之前
如例句： Do they live here? no, but they uesd to (live here)
2）当原句中的主要动词为be(am is are/ was were )是,我们省略到be为止,
Is he a teacher? No,he is not.But he used to be (a teacher)
3）当原句中的主要动词为完成时代（have/had done ）时,和第一种一样省略到done之前
如 has Jim got to the school? I hope that he has (got to the school)
译：吉姆到学校了吗?我希望他到了.
4）当原句中的主要动词为完成时态（have/had been )时,和第二种一样,省略到been为止
如 He must have been angry . ---I am not sure .he might have been (angry)
译:他刚才肯定很生气. ----我不确定.可能吧.
希望能帮到您
ps:括号里是省略的成分,省略是为了语言的简洁,
当然前提是不产生歧义,如果会产生歧义的话,就不要省略了

省略形式，记住就行。
再如，where to?（你要到那里去？）而习惯上不说where to go?这已经不是语法的问题了。

首先你得知道used to 的词性用法，在这里used to 不是动词词性，是表示习惯的和 always、oftensometimes差不多

used to do 过去常常回答句是they used to live here。省略了不定式后面的动词live

Do they live here?no,but they __.A,used to B.used to do 正确答案为A,为何B不行? Do they live far away ----No ,they live quite _____(nearly)适当形式填空 where do they live? Do you still live here?____.It is five months since I____hereA.Yes;lived B.No;lived C.Yes;stopped D No;began to live为什么 they used to live here等于什么 Will people live to be 200 years old?______ they can't live so long A.no they won'tB.no they don't C.yes they do D.yes they will Do you live here in techville是什么意思? do you enjoy live here 改错 Do you live here?(there)选择句 The Robertsons do not live here anymore.they now live in the (countryside country)书上正确答案是 country,那countryside为什么错了同义句转换：He said he would no longer live here.He said he()live here()(). where do they live?意思是什么? Do they live on the same floor Do they live far from your house You do not live here ,do not you? do they allow______(take photos) in the musem No we aren't allowed_______(take photos) here这里要填什么 He no longer live(这里应该用lives吧) here. 同义句转换：She no more live here.She ___ live here ____ _____.貌似要用到no longer,