has already been pointed out, grammar is not a set of dead rules.A. As　　　B. It　　C. That　D

发布时间：2020-08-16 20:48:41

     has already been pointed out, grammar is not a set of dead rules.
A. As　　　
B. It　　
C. That　
D. Which

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(答案→)A. As　　　
B. It　　
C. That　
D. Which
解析：定语从句。根据后面的逗号可知，此处为非限制性定语从句，放句首的只能选择as
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