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    精英家教网 > 高中英语 > 题目详情
    As a graducate in computer science, he ___ to work out the problem.
    A．wouldn't have failedB．can't have failedC．mustn’t have failedD．might not have failed
    B
    can’t/couldn't have done表示对过去发生的事情的否定推测。
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