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

发布时间：2020-08-21 02:24:45

While Helen      the guitar, 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：while引导时间状语从句，常用进行时态。
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