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While Helen ________ the piano,her mother came in.
A.was playingB.is playingC.playedD.plays
A

试题分析:句意:当海伦正在弹钢琴时,她的母亲进来了。While引导时间状语从句,强调主从动作的同时发生,从句中常用进行时态,联系下文可知从句描述的是过去正在进行的动作,故用过去进行时态,选A。
点评:英语宾语从句的时态和主句没有必然的联系,需结合语境进行具体分析。而英语状语从句的时态与主句有比较紧密的联系。
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