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

问题补充：

John fell asleep he was listening to the music.

A. after

B. before

C. while

D. as soon as

答案：

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。