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【单选题】

The human beings have polluted the environment seriously. It is time the United Nations must take some measures.
A．take

B．taking
C．to take
D．took
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根据网考网移动考试中心的统计，该试题：

4%的考友选择了A选项

37%的考友选择了B选项

5%的考友选择了C选项

54%的考友选择了D选项

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