You look very tired and you must have been preparing for the coming examination yesterday

You look very tired and you must have been preparing for the coming examination yesterday evening, you ?
A. didn’t you
B. haven’t
C. weren’t
D. hadn’t

A. didn’t youB. haven’t(答案→)C. weren’tD. hadn’t解析：当陈述部分带有情态动词must表示“必须”时，疑问部分用mustn’t。如： 　　You must work hard next term, mustn’t you? 　　I must answer the letter, mustn’t I?但若表推测这层含义时，不能用must，而要根据陈述部分must之后的动词而定，如果句子中有明确的过去时间，反意疑问部分与must之后的动词有关，不可用haven’t的形式。如： 　　You must have made a mistake, haven’t you? 　　They must have seen the film last week, didn’t they? 　　He must be in the library, isn’t he?故本题中选C.

这个答案应该是对的

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