______ the compass was first made in China.A、It is known to allB、It is known th

游客2025-03-12 1

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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