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    精英家教网 > 高中英语 > 题目详情
    They must have been here the day before yesterday,＿＿＿＿?
    A．mustn’t theyB．didn’t they C．mustn’t have theyD．had they
    B
    must have done表示对过去发生情况的肯定推测，句中带有明确的过去时间状语，故附加疑问句用“didn’t they”。
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