I failed in the exam. How I regretted the days when I______and ______.A、played.

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问题 I failed in the exam. How I regretted the days when I______and ______.

选项 A、played. .. should have studied
B、had played. .. had studied
C、should have played.. . had studied
D、had played. . . should have studied

答案 D

解析 前一个用过去完成时,表示从句动作在主句动作之前发生,后一个用should have+过去分词,表示应该做某事而未做。
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