【单选题】

Not until the 1980's ______ 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：

6%的考友选择了A选项

21%的考友选择了B选项

17%的考友选择了C选项

56%的考友选择了D选项

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