题目

Many workers were organized to clear away ________ remained of the           World Trade Center. 　　A. those　　　　　　　　　　　　　B. that 　　C. what　　　　　　　　　　　　　D. where 答案：C 解析: 此处what=the thing（s）that，引导名词性从句，且在从句中作主语。

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