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    28．He didn’t pass the exam. As a good student, he . A．should have failed B．shouldn’t have failed C．must have failed D．mustn’t have failed 【查看更多】

     

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    He didn’t pass the exam. As a good student, he         .

    A．should have failed                              B．shouldn’t have failed

    C．must have failed                               D．mustn’t have failed

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