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___ has already been pointed out,grammar is not a set of dea

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___ has already been pointed out,grammar is not a set of deal rules.A:As B:It C:That D:Which
___ has already been pointed out,grammar is not a set of deal rules.A:As B:It C:That D:Which 选什么,
答案是A as
as 是关系代词 代替 后面的grammar is not a set of deal rules.整句话
引导非限制性定语从句 并在从句中 作主语.
选项B 应该 把逗号去掉 加that .这就是主语从句.
选项C .应该把that放在 后面句子的前面,然后把后面的句子 放到句首.也是主语从句.
选项D 引导非限制性定语从句 只能放在 后面.