John fell asleep_____ he was listening to the teacher in class. [ ]A. after B. before C. as soon as

题目简介

John fell asleep_____ he was listening to the teacher in class. [ ]A. after B. before C. as soon as

题目详情

John fell asleep_____ he was listening to the teacher in class.      
[     ]

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

题型:单选题难度:中档来源:同步题

答案

D

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