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
A
句意：媽媽，恐怕要下雨了。天空中的云越來(lái)越密集了。build up逐漸增加，符合句意。break up打碎，分裂，解體；stay up不睡覺(jué)，熬夜；get up起床。
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