No matter how bright a talker you are, there are times when it’s better silent.
A. remain
B. to remain
C. having remained
D. to be remained
网友回答
A. remain
(答案→)B. to remain
C. having remained
D. to be remained
解析：考查不定式做主语。本句中的it是形式主语，真正的主语是后面的不定式to remian silent；句意：无论你是一个多么聪明的谈话者，也有一些时候最好保持沉默。故B正确。