Question

【题目】John fell asleep _____________he was listening to the music.

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

Answer 1

【答案】C

【解析】

试题分析：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。