He must be from Africa,____can be seen from his skin.

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He must be from Africa,____can be seen from his skin.
A.that B.as C.it D.what 请问为什么不是D

此题考查的是非限制性定语从句的用法.选项B指代前面整句话.而what不能引导定语从句.
再问： ��which�ɲ��԰�
再答： �ʵúá��which��which��as ��Ӿ䣬ָ��仰��as��ھ��ף�Ҳ��ھ��У��which�ǲ��ھ��׵ġ� ף��ѧϰ��

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