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【单选题】

thE mAChinE CAn't BE pErFECtED ovErnight; in FACt, it shoulD BE improvED ______ .
A．onE AFtEr AnothEr
B．By turn
C．Fight AwAy
D．stEp By stEp

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根据网考网移动考试中心的统计，该试题：

1%的考友选择了A选项

27%的考友选择了B选项

1%的考友选择了C选项

71%的考友选择了D选项

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