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【单选题】

He has worked very hard ______ he entered the factory.
A.when

B.till
C.while
D.since
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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

5%的考友选择了C选项

63%的考友选择了D选项

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