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【单选题】

Only recently ______ possible to separate the components of fragrant substances and to determine their chemical composition.
A．it becomes

B．having become
C．has it become
D．which becomes
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根据网考网移动考试中心的统计，该试题：

89%的考友选择了A选项

7%的考友选择了B选项

3%的考友选择了C选项

1%的考友选择了D选项

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