---What did you think of Act I of the play last night?---I’m sorry. The play ________ when I got there.A.had been startedB.had been on for half an hourC.was to startD.had begun for half an hour
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B解析句意：戏剧在我到达之前就已上演了半小时，即表示“过去的过去”，且短暂性动词不与持续性时间连用，故须将 start→be on 才可与持续性时间连用。