-CanIgoswimming,Mom?-Certainly.Butyou

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问题详情:

-CanIgoswimming,Mom?-Certainly.Butyou

-Can I go swimming,Mom?

-Certainly.But you ____ be back by four.

A.can     B.may    C.might  D.must

【回答】

D

知识点:情态动词

题型:选择题

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