问题
选择题
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
答案：A
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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：A