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11.John waited at the bus-stop for nearly half an hour _____ the bus finally arrived.(  )
A.whenB.asC.beforeD.while

分析 在公共汽车最后来之前,约翰在公交站头已等了将近半个小时了.

解答 答案:C 根据选项 when和while都有"当…时"之意,when既可以跟延续性动词,又可以跟瞬间动词,while只可跟延续性动词,as强调一边,一边,before在…之前,再结合句意,在公共汽车最后来之前,约翰在公交站头已等了将近半个小时了.可知此处应是在…前,故C正确,

点评 本题考查时间状语从句的连接词,在充分分析句型再结合语义的基础上便能选出正确答案,同时要注意其他选项的意思,

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