— Did you see the beginning of the film?

— No. It ________ for 20 minutes when I got to the cinema. [ ]

A. has been on

B. had been on

C. had begun

D. has begun

从1956年开始，我国开辟了（）。

A.班轮航线

B.定期租船航班

C.独立的远洋航班

D.以上不不对