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  • 科目:英语
  • 题型:单选题
  • 难度:中等
  • 人气:547

Because of H7N9 bird flu,all the chicken markets in Shanghai  have been closed and won’t open until further________.

A.sign   B.symbol
C.signal    D.notice
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BecauseofH7N9birdflu,allthechi