【单选题】

Rivers have been important to man ______.
A．since the last century

B．for a very long time
C．since a few hundred years ago
D．since a few years ago

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根据网考网移动考试中心的统计，该试题：

29%的考友选择了A选项

63%的考友选择了B选项

4%的考友选择了C选项

4%的考友选择了D选项

Rivers have been important to man ______.A．since the last century