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【单选题】

It could have saved me some trouble ______ about it.

A．had I known

B．I had known
C．did I know
D．I knew
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根据网考网移动考试中心的统计，该试题：

80%的考友选择了A选项

6%的考友选择了B选项

11%的考友选择了C选项

3%的考友选择了D选项

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