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.
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