问题补充:
He is good at English, we all know.
A. that
B. as
C. whom
D. what
答案:
A. that
B. as
C. whom
D. what
解析:as作关系代词可以单独用来引导非限制性定语从句。这时as所指代的不是主句中某个名词,而往往指代整个主句的含义。as在从句中可以作主语、宾语。从句可放在主句后,也可置于主句前。在本句中,as作宾语.
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