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No matter how bright a talker you are, there are times when it is better ______ silent.
A.remainB.be remaining
C.to remainD.having remained
C

试题分析:考察不定式做主语用法。本句中的不定式to remain silent在句中作真正的主语,前面的it是形式主语。句意:无论你是一个多么聪明的谈话的人,也有一些时候最好要保持沉默。不定式做主语的时候,表示的是一次性具体的行为,故C正确。
点评:形式主语,顾名思义,即形式上是主语,但实际上不是真正的主语,真正的主语是后面的动词不定式、动名词或主语从句等。如果让后面的动词不定式、动名词或主语从句用作主语,那么在句式上容易造成“头重脚轻”,句式不平衡,故往往用it作形式主语,而把真正的主语放在后面。it在这里没有任何意义。
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