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当先行词有the same, such, so, as等修饰时,我们常用关系代词as来引导该限制性定语从句。引导非限制性定语从句时,as可以在从句中作主语、宾语或表语,其先行词为整个句子,可译 为"正如……"。多用于as is known, as is said above, as can be seen, as is mentioned, as is reported 句式中。

注意:which也可引导非限制性定语从句,其先行词也可以是整个句子,但引导的非限制性定语从句只能放在主句后面;as有"正如,正像"之意,而which没有。

【考试例析】________ I explained on the phone, your request will be considered at the next meeting. 

A. When B. After C. As D. Since

中公教育解析:选C。as引导非限制性定语从句,先行词为your request will be considered at the next meeting。句意:正如我在电话里解释的,下一次会议将考虑你的要求。

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