题目内容：

--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

优质解答

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.