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

試題分析：考察不定式做主語用法。本句中的不定式to remain silent在句中作真正的主語，前面的it是形式主語。句意：無論你是一個多么聰明的談話的人，也有一些時候最好要保持沉默。不定式做主語的時候，表示的是一次性具體的行為，故C正確。
點評：形式主語，顧名思義，即形式上是主語，但實際上不是真正的主語，真正的主語是后面的動詞不定式、動名詞或主語從句等。如果讓后面的動詞不定式、動名詞或主語從句用作主語，那么在句式上容易造成“頭重腳輕”，句式不平衡，故往往用it作形式主語，而把真正的主語放在后面。it在這里沒有任何意義。
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