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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 1355

The zoo keeper is worried because the number of visitors ______ smaller and smaller .

A.is becoming B.become C.became D.to become
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Thezookeeperisworriedbecauseth