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【单选题】

By the year 2010, scientists probably ______ an effective treatment for cancer.
A．will have discovered
B．are discovering
C．will be discovering
D．have discovered

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根据网考网移动考试中心的统计，该试题：

51%的考友选择了A选项

8%的考友选择了B选项

26%的考友选择了C选项

15%的考友选择了D选项

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