He can only blame himself for failing the exam. He ______ harder during the year

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问题 He can only blame himself for failing the exam. He ______ harder during the year, but he seemed to go out with a different gift every weekend.

选项 A、would have worked
B、should have worked
C、must work
D、ought to work

答案 B

解析 should have done表虚拟语气，本应该做却没做。句意：考试没过，他只能怪自己。这一年他本应该努力学习的，但事实上他每周似乎都和不同的女孩外出。

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