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    精英家教网 > 高中英语 > 题目详情

    【题目】The boss ______ the worker how to do it, or the accident couldn’t have happened.
    A.can’t have told
    B.ought to tell
    C.could have told
    D.mustn’t have told

    【答案】A
    【解析】从句意看，选项是对过去的否定推测，应该用can’t have done。句意为：老板不可能告诉工人们怎么做了，否则就不会发生事故了。

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