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：句意：幾種新型的藥物對治療H7N9有積極的影響這件事已經(jīng)被證明。that 引導(dǎo)主語從句，that 不做成分，但是不可以省略；it是形式主語，在主語從句中，which 意為：哪一個；what 什么；if 是否。kinds是“種類”的意思，是復(fù)數(shù)做主語，所以謂語應(yīng)該用have，故選C。

考點：考查主語從句的關(guān)系詞和主謂一致的用法。

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