The film for twenty minutes when they got to the cinema．
A. had already been on
B. has already been on
C. had already begun
D. has already begun
网友回答
(答案→)A. had already been on
B. has already been on
C. had already begun
D. has already begun
解析：考查时态。句意：当我们到达电影院时，电影已经上演了20分钟。结合语境可知主句描述的是过去已经完成的动作，故用过去完成时态。瞬间动词begin不能和表示一段时间的时间状语连用，故选A。