Tom passed the exam . He didn’t study well for it. The exam difficult. A. must hav——青夏教育精英家教网—

摘要： 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

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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

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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