They must have been here the day before yesterday,__________?
They must have been here the day before yesterday,__________?
A.mustn't they B.didn't they
C.mustn't have they D.had they
为什么有yesterday 就要用didn't they?
A.为什么不可以呢?
A.mustn't they B.didn't they
C.mustn't have they D.had they
为什么有yesterday 就要用didn't they?
A.为什么不可以呢?
英语人气：180 ℃时间：2019-10-24 02:15:56
优质解答
这里的must表示推测不是一般情态动词的用法,所以要看主句的时态,因为是一般过去时（yesterday）,所以要用助动词didn't
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