Rain is pouring down from the sky without any sign of stopping．Farmers begin to worry about their crops since it _____ as long as 24 hours．
A．would rain B．had rained C．was rainingD．has been raining
D
考查時態(tài)。句意：雨水從天空傾盆而下，沒有一點停的跡象。由于雨一直不停的下了24個小時了，農(nóng)民們開始擔(dān)心他們的莊稼。結(jié)合語境可知下文描述的是現(xiàn)在已經(jīng)完成的正在進行的動作，故用完成進行時，選D。
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