【題目】 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】D

【解析】句意：不管你是一個多么聰明的健談?wù)撸袝r你最好保持沉默。分析句子可知在when引導(dǎo)的時間狀語從句中使用了常用句型“it is + adj. +to do”，it作形式主語，真正的主語是動詞不定式，故D項正確。

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