--I'll be able to come to see your performance at 8:30tomorrow evening.
问题描述：
--I'll be able to come to see your performance at 8:30tomorrow evening.
--I'm sorry ,by then my performance()and I()reporters in the meeting room.
Awill be ended ;will meet B is to end ；will meet C will have ended ;will be meeting
D will be ended ;am going to meet
选Cwhy
答
将来进行时主要表示将来某一时间正在进行的动作,或表示要在将来某一时 将来进行时间开始,并继续下去的动作.常用来表示礼貌的询问、请求等.如：This time next day they will be sitting in the cinema.将来进行时常用的时间状语 Soon,tomorrow,this evening,on Sunday,by this time,tomorrow,in two days,tomorrow evening,By this time tomorrow,I'll be lying on the beach.等等.
by then -- 到那时一般与现在完成时连用.但是上文是8:30tomorrow evening,所以时态是将来完成时.利用排除法就选c 如果要问 my performance是否为承受者的话,我自己觉得这里作主语,不是被结束的意思.