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 have stayed
D、have been stayin

答案C

解析 动词时态。by引导的介词短语表示时间,后面主句要用完成时;同时by后的时间用了一般现在时,表示将来的含义,所以主语使用将来完成时。
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