He met many problemshe was going over his lessons._刷题宝

题干

He met many problems he was going over his lessons.

A：before

B：as soon a

C：since

D：while

上一题下一题 0.0难度选择题更新时间:2010-07-23 10:26:20

答案(点此获取答案解析）

D

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