摘要：2． as引导非限制性定语从句.指代逗号前的整个句子.可置于句首或句末. This elephant is like a snake, as anybody can see. Mary was late for school, as often happened. As is known to all, the earth is round. ★ as 指代一句话和which 指代一句话的用法区别 as 的这种用法通常出现在一些固定短语之中如: 1．as has been said before 如上所述
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选择最佳答案，完成非限制性定语从句
________, the compass was first invented in China．
[ ]
A．
It is known to all
B．
It is known that
C．
We all know
D．
As is known to all
选择最佳答案，完成非限制性定语从句
He must be from Africa, ________ can be seen from his skin．
[ ]
A．
that
B．
as
C．
who
D．
what