问题
选择题
(2012·浙江高考)No matter how bright a talker you are, there are times when it's better ________ silent.
A．remain
B．be remaining
C．having remained
D．to remain
答案
答案：D
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。