【单选题】

Not until the 1980s ______ in Beijing start to find ways to preserve historic buildings from destruction.
A．some concerned citizens

B．some concerning citizens
C．did some concerning citizens
D．did some concerned citizens

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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

15%的考友选择了B选项

10%的考友选择了C选项

71%的考友选择了D选项

Not until the 1980s ______ in Beijing start to find ways to preserve historic buildings from destruction.A．some concerned citizens