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    (   ) 5. There are some volunteers______ litter on the street. Let's join them.

           A. clean    up B. cleaning    up

          C. to    clean up D. cleaned    up

    B    There be + sth. /sb. doing sth.为固定句型，意为"有某人或某物正在做……"。

    题目来源：仁爱英语同步练习册九年级上册仁爱版 > Topic1 Pollution has caused too many problrms.

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    根据短文内容，选择正确答案。

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