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    -Why didn’t Susan come to see us yesterday as she promised? - . A.She must be busy B. She might have been free C.She must have been busy D. She can’t be free 【查看更多】

     

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    －Why didn’t Susan come to see us yesterday as she promised?
    －______. 

    A．She must be busyB．She might have been free
    C．She must have been busyD．She can’t be free

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