这是用as引导的定语从句吗?He must be from Africa ,____ can be seen from his skin.A as B it it为什么不得?

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这是用as引导的定语从句吗?He must be from Africa ,____ can be seen from his skin.A as B it it为什么不得?
这是用as引导的定语从句吗?
He must be from Africa ,____ can be seen from his skin.
A as
B it
it为什么不得?

这是用as引导的定语从句吗?He must be from Africa ,____ can be seen from his skin.A as B it it为什么不得?
之所以不选it是因为,前面是个逗号,也就是前后两句话的主语必须要一致.用了it主语就不一致了,前面是he,后面是个形式主语.
as在这里的意思是"因为"的意思.