--Pity you missed the lecture on nuclear pollution.-- I it but I was busy preparing for

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：考查虚拟语气。would have attended本想参加的，实际上没有参加。