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    精英家教网 > 高中英语 > 题目详情
    The task _______ by the time you come back.
    A．has been completedB．will have been completedC．will completeD．has completed
    B
    此题考查时间状语从句。by the time+一般现在时态，主句应用将来完成时态，by the time+一般过去时态，主句应用过去完成时态，题中by the time后面是一般现在时态you come back，故选B，若掌握by the time的用法，就不难了。
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