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They must be your classmates, ________ they?

[  ]

A.aren't
B.must
C.mustn't
D.are

答案:A
解析:

  本题主要考查学生对must表示推测意义的掌握。在英语的反意疑问句中,我们经常见到前面是一个肯定句,后面是一个简洁的疑问句;表现形式是前句是肯定形式,后句自然为否定,反之亦然。例如:

  You are a student, aren't you?

  你是个学生,是吗?

  She went to see her mother yesterday, didn't she?

  她昨天看母亲去了,是吗?

  但在must表示推测的句子中,这其实就是一个颇为肯定的语气,构成该句的反意疑问句时,不能再套用must进行推测,而应该根据动作发生的时间来推测。例如:

  They must be hungry, aren't they?

  他们一定是饿了,是吗?

  You must have forgotten it, haven't you?

  你想必将它忘了,是吗?


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