John fell asleep he was listening to the music.A. afterB. beforeC. whileD. as soon as

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A. after
B. before
(答案→)C. while
D. as soon as
解析：after在……之后；before在……之前；while当……时，强调动作同时发生；as soon as一……就。句意：当他正听着音乐时，约翰就睡着了。结合语境可知选C。