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 你到達(dá)倫敦的時候，我們都在歐洲呆兩周了．

解答 答案：C
句中by the time you arrive in London表示到將來的某個時間為止，是將來完成時態(tài)的時間狀語，表示在將來的某個時間之前已經(jīng)發(fā)生或完成的動作．故選C．

點評 將來完成時是用在表示在將來某一時間以前已經(jīng)完成或一直持續(xù)的動作．經(jīng)常與before+將來時間或by+將來時間連用，也可與before或by the time短語引導(dǎo)的現(xiàn)在時的從句連用．

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