◎ 题干
— 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 hour
C.was to startD.had begun for half an hour
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“— 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…”主要考查了你对  【一般现在时】【将来进行时】【过去完成进行时】【过去将来时的被动语态】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。