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：考查情态动词+ have done. Would have done意为“本应该干什么, 但是没有干”
