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thetimefortheexamcametoanend------Iknewit.A.untilB.afterCbeforeDwhile哪个选项?为什么?还有我不太懂这句的意思能翻译下最好

题目详情
the time for the exam came to an end ------I knew it.
A.until B.afterC beforeDwhile
哪个选项?为什么?还有我不太懂这句的意思能翻译下最好


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答案和解析
选C.句意:不知不觉,考试结束了.
【注意】before 的不同翻译方式.
He ran off before I could stop him.我还没来得及阻止他,他就跑掉了.
Take it down before you forget it.趁着还没忘记的时候就记录下来.
We hadn’t run a mile before he felt tired.我们跑不到一英里他就感到累了.
The big fire lasted for three days before it was put out.大火烧了三天才被扑灭.