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        1. A large number of students           planting trees now, the number of the students         2000.
          A.is, isB.a(chǎn)re, isC.is, areD.a(chǎn)re, are
          B
          考察主謂一致。句意:許多學生正在植樹。這些學生的數(shù)目是2000.結(jié)合語境可知前文a number of表示許多人,主語是復數(shù),故系動詞用are。下文the number of……的數(shù)目,主語是抽象名詞,不可數(shù),故系動詞用is。選B。
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