吉利英伦报价2013款:英语选择题

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There is no light in the dormitory.they musthave gone to the lecture,______?
A.didn't they B.don't they
C.mustn't they D.haven't they

b

C

选d吧。有种情况选a,好像是有过去某个时间限制时。现在不大记得了。

d

A