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    15．-You look tired. -Yes, I non-stop until six o’clock this morning. A．have been working B．had worked C．was working D．am working 【查看更多】

     

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    －You look tired．

    －Yes, I ________．non-stop until six o’clock this morning．

    [　　]

    A．have been working

    B．had worked

    C．was working

    D．am working

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