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    8．By the time you arrive in London，we_____in Europe for two weeks．（　　）
    A．shall stayB．have stayed
    C．will have stayedD．have been staying

    分析 你到达伦敦的时候，我们都在欧洲呆两周了．

    解答 答案：C
    句中by the time you arrive in London表示到将来的某个时间为止，是将来完成时态的时间状语，表示在将来的某个时间之前已经发生或完成的动作．故选C．

    点评 将来完成时是用在表示在将来某一时间以前已经完成或一直持续的动作．经常与before+将来时间或by+将来时间连用，也可与before或by the time短语引导的现在时的从句连用．

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