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It has been proved ____ several new kinds of medicine____ a positive effect on the cure of H7N9.

A. which,has B. if, has

C. that, have D. what, have

C

【解析】

试题分析:考查名词性从句和主谓一致。本题中的it是形式主语,真正的主语是后面的that引导的主语从句,that在句中不充当任何成分,只是一个引导词而已。主语从句中的主语是several new kinds of medicine谓语动词应该和kinds保持一致,所以使用复数形式have。故C正确。

考点:考查名词性从句和主谓一致

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