下面哪个句子是混合虚拟语气结构？
A.If I were you， I would not fail.
B.If I had worked harder， I would have passed the examination.
C.If he had worked harder three years ago，he would be in college now.
D.If I were to be a NBA super star， I would help Chinese basketball players to improve their skills.
正确答案：If he had worked harder three years ago，he would be in college now.
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