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