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    【题目】It is important _____ how to ask for help politely.

    A. know B. knowing C. to know D. to knowing

    【答案】C

    【解析】

    句意：知道如何礼貌地寻求帮助很重要。考查非谓语动词。It’s +形容词+（for sb.）+to do sth.：做某事（对于某人来说）是什么样子的，it是形式主语，动词不定式to do sth.是真正的主语。结合句意可知填to know，选C。

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