— You________have finished your composition.

— I had meant to, but before I could, the bell rang and we had to hand in our test papers . [ ]

A. were supposed to  

B. were able to

C. had to  

D. were determined to

艺术团有紧急通知，老师要尽快通知队中的60名队员，如果用打电话的方式，第一分钟通知第一个队员，第二分钟老师与第一个队员分别通知一个队员…以此类推，要多少分钟通知到所有队员？