◎ 题干
—  Look! The black clouds are gathering, which indicates that it __________ rain soon.
— Yes, black clouds are the _________ of the rain.
[     ]
A. is going to; signal      
B. will; mark
C. is gong to; sign
D. is to; sign
◎ 答案
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◎ 解析
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◎ 知识点
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