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【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

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