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【单选题】

Mr. Smith ______working till he was seventy years old.
A.kept up

B.kept on
C.kept to
D.kept out
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根据网考网移动考试中心的统计,该试题:

9%的考友选择了A选项

65%的考友选择了B选项

6%的考友选择了C选项

20%的考友选择了D选项

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