______ the compass was first made in China.

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问题 ______ the compass was first made in China.

选项 A、It is known to all
B、It is known that
C、We all know
D、As is known to all

答案D

解析 本题考查的是固定结构as is known to all,即众所周知。因为这是非限定性定语从句,所以与主句用逗号隔开。而若用 it is known to all,则是 it 做形式主语的情况,后面直接加 that,不用标点符号,故排除A,D.
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