—Isthereanyvaccine(疫苗)againstH

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更新 2022-09-03
科目英语
题型单选题
难度较易
浏览 1177

—Is there any vaccine(疫苗) against H1N1 flu that can be used on humans?
—No, but scientists are working to develop ________ .

A．that

B．it

C．one

D．so

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