Lucy fell asleep she was listening to music.A. beforeB. whileC. afterD. as soon as

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A. before
(答案→)B. while
C. after
D. as soon as
解析：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。