【题目】I would have attended Jacky Cheung's live music concert had it been possible, but I ______ so busy at that time.
A. had been B. were
C. would be D. was
在线课程【答案】D
【解析】
考查时态。句意：如果可能的话，我会参加张学友的现场音乐会，但那时我很忙。前句是与过去事实相反的虚拟语气，所以判断是陈述的过去的事情，故用一般过去时。故选D。