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      (   ) 5.——What will you do if you see others      __ ？

            ——I'll ask them to pick it up and throw it into the dustbin.

      A. littered B. littering

      C. litter D. to litter

    5. B see sb. doing sth.意为"看到某人正在做某事"。

    题目来源：仁爱英语同步练习册九年级上册下册合订本 > Topic1 Pollution has caused too many problrms.

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