By the time you arrive in London, we ______ in Europe for two weeks.

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问题 By the time you arrive in London, we ______ in Europe for two weeks.

选项 A、shall stay
B、have stayed
C、will havc stayed
D、have been staying

答案C

解析 从句时态。by the time引导的时间状语从句中若谓语动词用现在时,则主句要用将来完成时;若谓语动词用过去时,则主句要用过去完成时,有时也可以用过去将来完成时。因此,本题的正确答案是C。
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