________,thecompasswasfirstinvented

发布时间：2020-07-26 11:02:40

________, the pass was first invented in China．A.It is known to allB.It is known thatC.We all knowD.As is known to all

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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 pass was first invented in China．”。
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