【单选题】

__________ her address, we couldn't get in touch with her.

A. Not to know
B. Having been known
C. Not knowing
D. Not been known

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根据网考网移动考试中心的统计，该试题：

19%的考友选择了A选项

7%的考友选择了B选项

64%的考友选择了C选项

10%的考友选择了D选项