Q:

The little girl ________,but her family couldn’t afford it at that time.

A.could go to school

B.could have gone to school

C.must have gone to school

D.can have gone to school

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正确答案:B

对过去事情表示猜测,应用情态动词的完成式。could have done表示“本有可能,但却没有”。

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