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【单选题】

Since the time humankind started gardening, we __________ to make our environment more beautiful.

A、try
B．have been trying
C．are trying
D．will try
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根据网考网移动考试中心的统计，该试题：

27%的考友选择了A选项

72%的考友选择了B选项

0%的考友选择了C选项

1%的考友选择了D选项

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