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【单选题】

He ______ at the steel plant since 1949.
A. was working
B. worked
C. has been working
D. work

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根据网考网移动考试中心的统计，该试题：

13%的考友选择了A选项

28%的考友选择了B选项

55%的考友选择了C选项

4%的考友选择了D选项

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