题目内容

John fell asleep _____________ he was listening to the music.

A. after B. before C. while D. as soon as

C 【解析】试题句意:当约翰听音乐时,他睡着了。A.after在……后;B.before在……以前;C.while当……时。强调主从句的两个动词同时发生。结合句意,故选C。
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