John fell asleep ___he was listening to the musicA afterB beforeC whileD until
问题描述：
John fell asleep ___he was listening to the music
A after
B before
C while
D until
答
选C,约翰听着音乐入睡了~
while表示状态是伴随进行的,他在听音乐的时候不知不觉睡着了