题目内容

Lucy fell asleep_______ she was listening to music.
A．beforeB．whileC．afterD．as soon as
B
词义辨析。Before在……之前；while 当……时候；after在……之后；as soon as一……就。根据she was listening to music用的是过去进行时，所以选B。露西听音乐时想睡觉。
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