he must be from Africa,___can be seen from his skin.

问题描述:

he must be from Africa,___can be seen from his skin.
A that B as C it D what 选什么,为什么选这个?

B.这是个定语从句,由as 引导,先行词是前面整个句子.that 不能引导非限制性定语从句,用it 虽然解释的通,但是个错误的结构,中间有个and 的话,就可以用it.what 不能引导定语从句.