【单选题】
______ how to deal with the trouble of the computer, Martin had to ask his brother for help.
A.Not know
B.Not known
C.Not to know
D.Not knowing
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根据网考网移动考试中心的统计,该试题:
16%的考友选择了A选项
6%的考友选择了B选项
1%的考友选择了C选项
77%的考友选择了D选项