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    【题目】

    --- You look great!

    --- I ______ out. Check out my muscles!

    A. will work

    B. was working

    C. have been working

    D. had been working

    【答案】C

    【解析】现在完成进行时表示现在以前这一段时间里一直在进行的动作，这动作可能仍在进行，也可能已停止。根据句意可知这一段时间我一直在锻炼。故答案选C。

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