He must have lost the key the day before yesterday,_____?A.must h_英语解答

He must have lost the key the day before yesterday,_____?
A.must he B.hasn't he C.needn't he D.didn't he
答案应该选D,为什么不选B?请说明原因,

人气：376 ℃　时间：2019-10-17 01:33:40

解答

must + have done 时表示推测的一种句型,表示对过去发生动作的推测时,看作一般过去时态,也就是看作lost即可,后面问句就应该用一般过去时态（所以这里选了didn't he).