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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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