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— It’s raining. When did it start?

— As far as I know, it ____ for three hours.

A. rains B. rained

C. has rained D. will rain

 

C

【解析】

试题分析:句意:下雨了。什么时候开始的?——据我所知,已经下了三个小时了。结合语境可知本句描述的是从过去一直持续到现在的动作,故用现在完成时态。选C。

考点:考查时态辨析

 

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