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        1. --- Look! Lots of  people there. What’s wrong?
          --- An old lady was going across the road ________ a car hit her.
          A.whileB.a(chǎn)sC.whetherD.when
          D
          連詞辨析。在表示時間時,while強調(diào)動作同時發(fā)生。As強調(diào)伴隨動作,when當……時。Whether的意思是是否。句意:看,那兒有許多人,怎么了?——一位老太太正在過馬路,突然一輛汽車撞到了她。“ be doing…when…"是一個句型,多譯為"某人正在做……時,突然……"。故選D。
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