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

A. shall stay       B. have stayed       C. will have stayed       D. have been staying

C


解析:

by the time引導的時間狀語從句中使用了一般現(xiàn)在時表將來,主句應用將來時,因此排除B 、D。句意:當你到達倫敦時,我們將已經(jīng)在歐洲逗留兩周了。由此判斷應用將來完成時表示將來某一時間或動作發(fā)生之前已經(jīng)完成的動作。故選C。

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