问题
选择题
If you had joined the chat room ten minutes ago, you _____________what we were talking about.
A．would know
B．would have known
C．knew
D．had known
答案
答案：B
考查虚拟语气。句意“would+have+done”表示对过去事情的假设，意思是“本来会做”。如果你十分钟前加入聊天室，你就会知道我们正在谈论什么了。“would+have+done”表示对过去事情的假设，意思是“本来会做”。故选B。