下颌处于安静状态时，上下牙列之间的距离称为（）

A.颌间距离

B.垂直距离

C.息止间隙

D.息止位

E.正中位

Everyone at the meeting agreed to the suggestion _______ a new bridge _______ built across the river.                                 

A．that; have been

B．which; would be

C．as; should be

D．that; be