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It is important _____ how to ask for hel...

It is important _____ how to ask for help politely.

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

 

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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