问题补充:
While Helen the piano,her mother came in.
A. was playing
B. is playing
C. played
D. plays
答案:
(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。
时间:2020-04-09 11:09:32
While Helen the piano,her mother came in.
A. was playing
B. is playing
C. played
D. plays
(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。