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【单选题】

No one hopes that he will ______ his usefulness.
A．retain
B．keep
C．prolong
D．survive

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根据网考网移动考试中心的统计，该试题：

0%的考友选择了A选项

21%的考友选择了B选项

1%的考友选择了C选项

78%的考友选择了D选项

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