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【单选题】

He______in the emergency room when I arrived at the hospital.
A．has been treating

B．has treated
C．had treated
D．was being treated
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参考答案：

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根据网考网移动考试中心的统计，该试题：

4%的考友选择了A选项

28%的考友选择了B选项

18%的考友选择了C选项

50%的考友选择了D选项

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