英语单项题—Why didn't you help the little boy ?—Oh ,sorry. he had

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/05/25 01:24:59

英语单项题
—Why didn't you help the little boy ?
—Oh ,sorry. he had struggled to his feet _____I ran over
A.until B.before C.after D.since
1.before与until 的区别 2.before的可以用在任何时态吗?
_____ is known ,knowledge comes from pactice.
A.Which B.As C.It D.what
为什么不用As

—Why didn't you help the little boy
—Oh ,sorry.he had struggled to his feet before I ran over
until 通常与not连用
It is known ,knowledge comes from pactice.
用As是As it is known to all

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