作业帮Do they live here?no,but they __.A,used to B.used to do 正确答案
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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?
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
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
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