He met many problems he was going over his lessons.A. beforeB. as soon asC. sinceD. while

发布时间：2020-08-20 18:46:43

He met many problems      he was going over his lessons.
A. before
B. as soon as
C. since
D. while

网友回答

A. before
B. as soon as
C. since
(答案→)D. while
解析：翻译：当他正在复习他的功课时他遇见了很多困难
A在。。。。之前
B一。。。。就
C自从
D当。。。。时
故选D
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