定于从句,1)The sun is bigger than the moon,_____ we all know.A.a

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定于从句,
1)The sun is bigger than the moon,_____ we all know.
A.and B.as C.which D.that
这题因该选B,我选的是C,我的理解是we all know sth.前面整句做先行词,which作宾语,请问下我的思维哪里错了,应该以什么思路去做这题
(1) He is no longer _________ he used to be.
(2)He is no longer the man _________ he used to be.
A.whom B.that C.who D.what
这两句的答案分别是D,B
请讲下理由,

这里并不是一个定语从句,as sb.know是一个词组,即正如sb.所知.而且这里不符合从句的结构.
(1) He is no longer _________ he used to be.
首先排除B.这里牵涉到习惯的问题.很多人会选择C.但是实际上who指的是一个人,比如Bob,Tom,而what可以指一个怎么样的人.如果用who的话,就变成了he used to be Bob这样滑稽的意思了.
(2)He is no longer the man _________ he used to be.
这里已经出现the man,因此the man是先行词,that he used to be 修饰the man
不知道我说的够不够清楚

定于从句,1)The sun is bigger than the moon,_____ we all know.A.a The sun is bigger than the moon, _______ we all know it. A．a The sun is bigger than the moon, ____ we all know. A. and B. 翻译：The sun is bigger than the moon,and we all know it. The sun is bigger than the moon,__we all know it. The teacher said that the sun _____ bigger than the moon. A． The earth is bigger than the moon,____ we all know it sun is ___ bigger than the moon. we all know that the sun is larger than the moon 翻译：Do you know the fact that the sun is bigger than the moon The sun is ____ bigger than the moon. The sun is ____ bigger than the moon.选项在下.