No matter how bright a talker you are, there are times when it’s better _____ silent.
A．remainB．be remainingC．having remainedD．to remain
D
考察形式主語(yǔ)。It是形式主語(yǔ)，真正的主語(yǔ)是to remain silent.句意：無(wú)論你是一個(gè)多么聰明的人。有很多時(shí)候保持沉默都是最好的。
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