Whileotherscientistsarekeeping

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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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While other scientists are keeping____eye on changes in the H5N1 bird flu strain, the scientists in England are working on vaccines, in case it becomes highly infectious in ____humans.

A．a , /

B．an, /

C．the, an

D．an, the

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