--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

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

c

by +时间点 用完成时,这里then是将来的时间,所以用将来完成时
第二空,推测出,它省略了说话人都清楚地时间状语at 8:30tomorrow evening,所以用将来进行时,那个时间点我应该正在会议室会见记者们

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.

答案是 C
tomorrow evening. 是将来的时间,自然要用将来形式,而且,performance 是被演的,所以要用被动语态。
后面的那个,指的是那个时间,将会有一个会议,所以要用进行时态、
希望能后帮助到你!~~~