题目内容
John fell asleep ________ he was listening to the music
[ ]
A．after
B．before
C．while.
D．as soon as
答案：C
提示：
提示：
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该题题意为 "约翰在听音乐的时候睡着了.""听音乐的时候"是指一段时间，故要用连词while. while指一段时间时，后面的状语从句时态是进行时. 本题答案为C． |
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