But for those interruptions, the meeting half an hour ago.
A. was finished
B. would have finished
C. would finish
D. had been finished
网友回答
A. was finished
(答案→)B. would have finished
C. would finish
D. had been finished
解析：句意：要不是有这些打断，这个会议在半小时前就会结束了。But for“要不是”，But for those interruptions,=if it had not been for those interruptions,是和过去相反的虚拟语气，所以主句用would have done，选B。