—Tom,would you please come and help us with the computer at the meeting tomorrow?

题目

—Tom,would you please come and help us with the computer at the meeting tomorrow?
一I am sorry,but I ____then．
x05A．would have class x05B．will be having class
x05C．was going to have class x05D．am about to have class
为什么选B不选A?

答案

由于有时间状语的then因为then表示在将来某时正发生的动作,要用将来进行时,A为过去将来时,表示过去认为的将来会发生的事,所以不行 ,表示在将来的某个时间正在发生的动作,要用将来进行时的will be having class；而would have class 却是过去将来时,时态错误.