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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
考查时态。句意:雨水从天空倾盆而下,没有一点停的迹象。由于雨一直不停的下了24个小时了,农民们开始担心他们的庄稼。结合语境可知下文描述的是现在已经完成的正在进行的动作,故用完成进行时,选D。
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