He must come from Africa,___can be seen from his teeth and skin.
问题描述：
He must come from Africa,___can be seen from his teeth and skin.
A.that
B.what
C.as
D.where
答
He must come from Africa,__C_can be seen from his teeth and skin.
A.that
B.what
C.as
D.where
注意：as 表示“这点,这种情况”