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问题: 定语从句中疑问

Venus has a dense atmosphere,_____we know very little.
A its composition
B whose composition.
C.about which composition
D.zbout whose composition.
答案是D,我选了B。希望讲讲这两者的区别。

解答:

如果不用定语从句,句子应该是we know about the atmosphere very little.这里考察了词组know about.做这类题目时,考虑一下后面的从句中是否有词组或特殊用法