Youlookverytiredandyoumusthavebeenpreparingforthecomingexaminationyes

You look very tired and you must have been preparing for the coming examination yesterday evening, _________ you ?A.didn’t youB.haven’tC.weren’tD.hadn’t

C解析试题分析：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.考点：反意疑问句点评：反意疑问句是高一必修第三单元语法点，对于反意疑问句平时学习中要注意加强记忆各种形式，做到胸有成竹。

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