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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 606

The World Health Organization warned that Asian countries __________ attentive to bird flu since Asia ___________ got rid of the disease completely.

A.should keep; has B.must remain; has not C.ought to stay; has been D.shall be; has not been
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TheWorldHealthOrganizationwarn