最快的给予采纳!The zoo keeper is worried because the number of visitors ( ) smaller and smaller.A.become B.became C.is becoming D.have become

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最快的给予采纳!The zoo keeper is worried because the number of visitors ( ) smaller and smaller.A.become B.became C.is becoming D.have become

最快的给予采纳!The zoo keeper is worried because the number of visitors ( ) smaller and smaller.A.become B.became C.is becoming D.have become
最快的给予采纳!
The zoo keeper is worried because the number of visitors ( ) smaller and smaller.
A.become B.became C.is becoming D.have become

最快的给予采纳!The zoo keeper is worried because the number of visitors ( ) smaller and smaller.A.become B.became C.is becoming D.have become
C the number of.的数量 应视为单数