Question

If you ____ the chat room ten minutes ago, you ____ what we were talking about.

A．have joined; will know	B．would join; have known
C．should join; would know	D．had joined; would have known

Answer 1

D

考查虛擬語(yǔ)氣。句意：如果你十分鐘以前加入了聊天室，你就會(huì)知道我們正在談?wù)撌裁�。結(jié)合語(yǔ)境可知條件句中是對(duì)過(guò)去狀態(tài)的虛擬，故用過(guò)去完成時(shí)態(tài)，主句中用過(guò)去將來(lái)完成時(shí)態(tài)，“would+have+done”表示對(duì)過(guò)去事情的假設(shè)，意思是“本來(lái)會(huì)做”。故選D。