Nomatterhowbrightatalkeryouare，therearetimeswhenit'sbet...

问题详情：

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

【回答】

D　[it作形式主语，真正的主语是后面的不定式：to remain silent 可归结为句型：it is＋形容词/名词＋to do/that...。当然it也可以作形式宾语，如find/feel it ＋to do/that...。  ]

知识点：非谓语动词

题型：选择题