摘要： is known to all, China will be an and powerful country in 20 or 30 years’ time. A. That, advancing B. This, advanced C. As, advanced D. It, advancing 答:C．as引导的是定语从句.注意as引导的定浯从句与which引导的定语从句的比较: ① He is good at maths, as we all know. as 指前边整个句子的内容.在从句中做know的宾语. ② He is good at maths, as is known to all. as 还是指前边整个句子的含义.做从句中的主语. ③ He is good at maths, which makes his mother proud, which 也指前边句子的含义.做从句中的主语. ④ He is good at maths, which I personally doubt, for he never studies hard. which仍指 He is good at maths 这件事.傲从句中的宾语. 由此可以看出:as和which都可以引导非限制性的定语从句.都可以做从句的主语.也都可以傲从句的宾语.但其区别在于:①as傲从句的主语时.常用被动语态.which做从句的主语时.常用主动语态.②as引导的非限制性定语从句可放在句首.而which引导的非限制性定语从句不能放在句首.如 As we all know, he is good at maths.另外.注意as引导的非限制性定语从句与主语从句的区别: It is known to all that he is good at maths. (1t为形式主语.真正主语为that从句.) As is known to all, he is good at maths.

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