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【单选题】

Medical scientists are______a breakthrough in cancer research.
A．striving for

B．struggling against
C．fighting against
D．contending for
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参考答案：

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根据网考网移动考试中心的统计，该试题：

59%的考友选择了A选项

3%的考友选择了B选项

10%的考友选择了C选项

28%的考友选择了D选项

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