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    Tom passed the exam . He didn’t study well for it. The exam difficult. A. must have been B. shouldn’t have been C. can’t have been D. couldn’t be 【查看更多】

     

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    Tom passed the exam . He didn’t study well for it. The exam ______ difficult.
      A. must have been  B. mustn’t have been  C. can’t have been D. must be

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    Tom passed the exam . He didn’t study well for it. The exam ______ difficult.

    A. must have been B. mustn’t have been C. can’t have been D. must be

     

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