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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 较易
  • 浏览 1474

The zoo keepers is worried because the number of visitors  __       smaller
and smaller.

A.become B.became C.is becoming D.have become
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Thezookeepersisworriedbecauset