问题
选择题
Mom, 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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Mom, 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