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【单选题】

It is essential that mankind ______ways and means to protect the
environment.
A、adopt
B、have adopted
C、will adopt
D、will have adopted

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根据网考网移动考试中心的统计，该试题：

85%的考友选择了A选项

6%的考友选择了B选项

6%的考友选择了C选项

3%的考友选择了D选项

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