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    10、—Why do you look so tired，Steven? You must have stayed up late last night，_______?

    —Yes．I ______ busy with my preparation for the exam of late．

    A．didn’t you；have been                             B．haven’t you；had been

    C．needn’t you；was                                      D．mustn’t you；am

    10、A

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    —Why do you look so tired，Steven? You must have stayed up late last night，_______?

    —Yes．I ______ busy with my preparation for the exam of late．

    A．didn’t you；have been                             B．haven’t you；had been

    C．needn’t you；was                                      D．mustn’t you；am

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