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    精英家教网 > 高中英语 > 题目详情
    The engineers must have worked out the design by the end of last week，_______？
    A．mustn’t theyB．hadn’t they ?
    C．haven’t theyD．didn’t they?
    B?
    时间状语by the end of last week表示的是过去的过去，所以该填过去完成时。
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