widespreadofH1N1ischallengefor

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更新 2022-09-03
科目英语
题型单选题
难度较易
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____ wide spread of H1N1 is _____ challenge for the whole world. Confidence, cooperation and responsibility are keys to overcoming it.

A．A; the

B．A; a

C．The; the

D．The; a

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