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【单选题】

(Over) (the past) few years, medical researchers (are searching) for a means (to control) AIDS virus
A．Over

B．the past
C．are searching
D．to control
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根据网考网移动考试中心的统计，该试题：

86%的考友选择了A选项

1%的考友选择了B选项

4%的考友选择了C选项

9%的考友选择了D选项

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