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    精英家教网 > 高中英语 > 题目详情
    Lisa, now stop for a short break. You should know that you      all the morning.
    A．are workingB．had been workingC．have been workingD．have worked
    C
    考查动词时态。根据now stop for a short break，可知现在还在工作，再根据all the morning，可知整个早晨一直在工作，所以要用现在完成进行时态，表示从过去开始到现在一直在进行的动作。有可能还会进行下去。所以选C。
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