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】

試題分析：考查名詞性從句和主謂一致。本題中的it是形式主語，真正的主語是后面的that引導(dǎo)的主語從句，that在句中不充當(dāng)任何成分，只是一個引導(dǎo)詞而已。主語從句中的主語是several new kinds of medicine謂語動詞應(yīng)該和kinds保持一致，所以使用復(fù)數(shù)形式have。故C正確。

考點：考查名詞性從句和主謂一致

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