-- It’s a pity that you missed the lecture on nuclear pollution. I it but I was busy

问题补充：

-- It’s a pity that 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。I it, but I was busy preparing for a job interview.我本来可以去，但是我忙于准备一次工作面试。可知指的是过去的情况，虚拟要用would havedone结构。所以选D。