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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 321

When the H1N1 virus____ at first in Mexico, no one had the least idea that it would spread so rapidly throughout the world.

A.broke off B.broke down C.broke out D.broke away
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WhentheH1N1virusatfirstinMexic