china has hundreds of islands,____we all know.

问题描述:

china has hundreds of islands,____we all know.
A in which B at which C of which D which
,为什么?

know of是固定词组,表示非常了解,熟悉.
其实我个人觉得如果选D的话,语法上也是没有问题的.
C表达的意思更为准确一些