◎ 题干
Mum, I'm afraid it's going to rain.The clouds in the sky are ________.
[     ]
A.building up  
B.breaking up
C.staying up  
D.getting up
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“Mum, I'm afraid it's going to rain.The clouds in the sky are ________.[]A.building upB.breaking upC.staying upD.getting up…”主要考查了你对  【动词短语】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。