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精英家教網 > 高中英語 > 題目詳情

It is uncertain________side effect the medicine will bring about,although about two thousand patients have taken it.

A. that      

B. what 

C. how        

D. whether

B解析:句意:盡管大約有兩千名病人已經服用了這種藥物,但是它會產生什么樣的副作用現在還不能確定。根據句意可知應該選擇B項引導主語從句。what在這里實際上是作為形容詞來修飾后面的“side effect副作用”。一起作從句中bring about的賓語。

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