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【单选题】

To survive in the intense trade competition between countries, we must______ the qualities and varieties of products we make to the world-market demand.
A．improve

B．enhance
C．guarantee
D．gear
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根据网考网移动考试中心的统计，该试题：

15%的考友选择了A选项

3%的考友选择了B选项

27%的考友选择了C选项

55%的考友选择了D选项

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