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He must have finished his homework for a long time

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He must have finished his homework for a long time

He must have finished his homework for a long time,____he?  
A. mustn't  B. didn't  C. needn't  D. hasn't 

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    2010-04-02 21:34:42
  • He must have finished his homework for a long time,____he? 
    A. mustn't B. didn't C. needn't D. hasn't 
    【答案】 :B. didn't 
    【解析】 :没有吗 

    1***

    2010-04-02 21:34:42

  • 2010-04-02 19:51:20
  • B didn't 句中 must have done表示对过对的肯定推测,前肯定后面的反问用否定,是对过去时的did否定

    l***

    2010-04-02 19:51:20

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