Question

You look very tired and you must have been preparing for the coming examination yesterday evening, _________ you ?

1. A.
   didn’t you
2. B.
   haven’t
3. C.
   weren’t
4. D.
   hadn’t

Answer 1

C
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。