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这道题选c还是d

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﹡9. When we got to the theatre, the play for half an hour.
A. has started B. has been on C. had started D. had been on
解题思路: 见下
解题过程:
选D,因为完成时需要使用延续性动词,一般start由be on 代替,start是短暂性动词,所以选择D
最终答案:略