______ 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 本题考查现在分词。根据句子结构,该句前半部分应为非谓语结构,所以应首先排除A项。又因为该部分中动词know的逻辑主语是主句的主语Martin,两者为主谓关系,故排除B项。不定式用来表示目的或将来,现在分词可以用来表示原因或事实。根据句意,本句应表示原因,因此,答案为D项。
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