Whenweseedark________inthesky,we

发布时间:2020-07-27 17:19:22

When we see dark ________ in the sky, we know that rain may e soon.A.starsB.planesC.cloudsD.things

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C解析由下文的we know that rain may e soon可知选C最恰当.dark clouds意为“乌云”.
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