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【单选题】

We can separate the mixture into the pure chemical compounds ______ it is composed.
A．in which

B．of what
C．of which
D．from which
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根据网考网移动考试中心的统计，该试题：

1%的考友选择了A选项

10%的考友选择了B选项

84%的考友选择了C选项

5%的考友选择了D选项

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