“黄肠题凑”是木椁室发展的顶峰，“黄肠”指用松木的黄心积垒于棺外，“题凑’’指木头顶部皆内向。( )

No matter how bright a talker you are, there are times when it is better ______ silent.

A．remain

B．be remaining

C．to remain

D．having remained