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【单选题】

He felt very tired because he ______ 18 hours without a rest.
A．had worked

B．worked
C．was working
D．had been working
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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

36%的考友选择了B选项

5%的考友选择了C选项

55%的考友选择了D选项

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