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【单选题】

Up till the time the news was announced, this kind of chemical was used _______.
A、all over the world
B、all over the United States
C、on fruit trees and garden trees
D、onDouglas fir young trees

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根据网考网移动考试中心的统计，该试题：

5%的考友选择了A选项

10%的考友选择了B选项

1%的考友选择了C选项

84%的考友选择了D选项

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