Mom，I'm afraid it's going to rain．The clouds in the sky are ________．


  1. A.
    building up
  2. B.
    breaking up
  3. C.
    staying up
  4. D.
    getting up
A
句意：媽媽，恐怕要下雨了。天空中的云越來越密集了。build up逐漸增加，符合句意。break up打碎，分裂，解體；stay up不睡覺，熬夜；get up起床。
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