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,the compass was first invented in China. [ ] A. It is known to all B. It is kno

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,the compass was first invented in China. [ ] A. It is known to all B. It is kno

________ ,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

试题答案

答案:D

解析:

as可以用于句首引导非限制性定语从句,先行词是后面的整个句子。