While Helen the piano，her mother came inA. was playingB. is playingC. playedD. plays

发布时间：2020-08-22 20:38:22

While Helen      the piano，her mother came in．
A. was playing
B. is playing
C. played
D. plays

网友回答

(答案→)A. was playing
B. is playing
C. played
D. plays
解析：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。
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