问题描述：
They must have stayed at home last night,_________?
A.haven't they
B.didn't they
C.mustn't they
D.needn't they
这个题应该选哪个呢!
题干有没有问题呢?
A.haven't they
B.didn't they
C.mustn't they
D.needn't they
这个题应该选哪个呢!
题干有没有问题呢?
问题解答：
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