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        1. When the old man saw some litter on the ground, he quickly          .
          A.picked it up B.picked up itC.picked them upD.picked up them.
          A
          本題的含義是當(dāng)老人看到地上的垃圾,他會很快地把它們撿起來,pick up sth為此意,sth為代詞,應(yīng)放在pick和up之間,垃圾為不可數(shù)名詞用it,故本題選A。
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