(2012·浙江高考)No matter how bright a talker you are, there are times when it's better silent

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A. remain
B. be remaining
C. having remained
(答案→)D. to remain
解析：选D　考查非谓语动词。句意：不管你多么能言善辩，但有时候还是保持沉默更好。该题考查“it is＋形容词＋to do sth.”这一句型，句中to remain silent“保持沉默”是真正的主语，it是形式主语。