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【单选题】

Most environmental problems exist because adequate measures for preventing them______ in the past.
A．was not taken

B．were not taken
C．didn't take
D．haven't taken
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根据网考网移动考试中心的统计，该试题：

22%的考友选择了A选项

76%的考友选择了B选项

1%的考友选择了C选项

1%的考友选择了D选项

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