-What did Jack ask you just now?--He wanted to know how long when I reached the cinema

问题补充：

---What did Jack ask you just now?

--He wanted to know how long when I reached the cinema.

A. had the film been on

B. the film had started

C. the film had lasted

D. had the film ended

答案：

A. had the film been on

B. the film had started

(答案→)C. the film had lasted

D. had the film ended

解析：英语宾语从句中一般为陈述语序。句意：刚才杰克问你什么了？——他想知道当我到达电影院时，电影已经持续多久了？结合语境科学下文描述的是持续到某时的动作，故过去分词用持续性动词，start和end表示瞬间动作，选C。