______how to deal with the trouble of the computer, Martin had to ask his brother for help.

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问题 ______how to deal with the trouble of the computer, Martin had to ask his brother for help.

选项 A、Not know
B、Not known
C、Not to know
D、Not knowing

答案D

解析 句意:马丁不知道如何处理这台电脑的故障,不得不请他的哥哥帮忙。该题考查的是现在分词短语做状语,表原因。由于主语Martin与动词know是主动关系,所以用现在分词。根据题意用分词的否定形式,要在前面加not。因此,选D。
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