【单选题】

Dr.Bethune worked hard as if he ______.

A、never had felt tired B、had never felt tired
C、never felt tired D、was tired never

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根据网考网移动考试中心的统计，该试题：

24%的考友选择了A选项

55%的考友选择了B选项

18%的考友选择了C选项

3%的考友选择了D选项