SARS is an illness that can result in death unless left      in time.

A. to treat       B. treating   C. treated         D. treat

 

C

本句中的treat 充當(dāng)主語(yǔ)補(bǔ)足語(yǔ),且與主語(yǔ)SARS之間為被動(dòng)關(guān)系,故應(yīng)選擇過(guò)去分詞。

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