— 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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