单选题
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.
A、
would have worked
B、
should have worked
C、
must work
D、
ought to work
【正确答案】
B
【答案解析】
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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