问题补充：
What did John 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：从句要用陈述语序，又因为句中有how long所以动词应该用延续性动词，选C。 “约翰刚才叫你干什么”“他想知道当我到达影院时电影演了多长时间了。
