问题
选择题
While Helen __________ the guitar, her mother came in.
A．was playing
B．is playing
C．played
D．plays
答案
答案：A
while引导时间状语从句，常用进行时态。
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While Helen __________ the guitar, her mother came in.
A．was playing
B．is playing
C．played
D．plays
答案：A
while引导时间状语从句，常用进行时态。