中文谷WhileHelen
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问题详情：
While Helen _______ the piano, her mother came in.
A. was playing B. is playing
C. played D. plays
【回答】
A
知识点：动词时态
题型：选择题
标签：
WhileHelen
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问题详情：
While Helen _______ the piano, her mother came in.
A. was playing B. is playing
C. played D. plays
【回答】
A
知识点：动词时态
题型：选择题
