【題目】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：知道如何禮貌地尋求幫助很重要�？疾榉侵^語動(dòng)詞。It’s +形容詞+（for sb.）+to do sth.：做某事（對于某人來說）是什么樣子的，it是形式主語，動(dòng)詞不定式to do sth.是真正的主語。結(jié)合句意可知填to know，選C。

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