Question

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

Answer 1

答案：D
解析：

as引导的定语从句。另外，也可以用it引导形式主语的结构：“It is known to all that the compass was first invented in China．”。