在会场中有 5个人，每两个人必须握一次手，那么所有的人总共握了多少次手 ?
A、5*4*3*2*1D
暂无解析
Thebesttitleforthepassagewouldbe________.
You’dbetterletmeknowassoonasthereisa(n)____positioninthebranchoffice.
Underno_____willIgothereagain.
_____ifIhadarrivedyesterdaywithoutlettingyouknowbeforehand.
I’mworriedabouttheappearanceofthefloor.Ineedto_____it.
