— 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】

試題分析：句意：下雨了。什么時候開始的？——據(jù)我所知，已經(jīng)下了三個小時了。結合語境可知本句描述的是從過去一直持續(xù)到現(xiàn)在的動作，故用現(xiàn)在完成時態(tài)。選C。

考點：考查時態(tài)辨析

 

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