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    精英家教网 > 高中英语 > 题目详情
    He must have been late for the conference yesterday, _______?
    A．didn’t heB．hasn’t he
    C．mustn’t heD．wasn’t he?
    D?
    用must have done表示“对过去加以推测时”，其附加疑问部分要根据must后的动词形式和有无时间状语来确定用相应的时态。此句中动词是be，时间是yesterday，所以用wasn?t he。如果去掉yesterday，就应选B项。
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