【单选题】

______ the compass was first made in China.
A．It is known to all

B．It is known that
C．We all know
D．As is known to all

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根据网考网移动考试中心的统计，该试题：

2%的考友选择了A选项

24%的考友选择了B选项

11%的考友选择了C选项

63%的考友选择了D选项

______ the compass was first made in China.A．It is known to all