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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 1809

The number of air crashes that _______ in developing countries _________ increasing.

A.happens; is B.happen; is
C.happens; are D.happen; are
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Thenumberofaircrashesthatindev