问题补充：
—Pity you missed the lecture on nuclear pollution.
—I it ,but I was busy preparing for a job interview.
A. attended
B. had attended
C. would attend
D. would have attended
答案：
A. attended
B. had attended
C. would attend
(答案→)D. would have attended
解析：考查情景交际和虚拟语气。句意：--你错过了关于核污染的讲座真是遗憾。--我本来打算参加的，但是我在忙着准备一个工作面试。根据句意可知，是对过去事情的虚拟，相当于if I had been free, I would have attended。这里省略了if条件从句，主句用would have done。故选D。
