- How long has the movie ? About half an hour .A. begunB. startedC. shownD. been on

问题补充：

--- How long has the movie ?

--- About half an hour .

A. begun

B. started

C. shown

D. been on

答案：

A. begun

B. started

C. shown

(答案→)D. been on

解析：句意：这场电影开始多久了？--大概半小时了。begin,start为非延续性动词，不能与一段时间连用。在表示时间段时，应用be on表达开始。故选D.