2. 外语
  3. Not until the 1980s______in Beijing start to find ways to preserve historic buildings from destruction.

Not until the 1980s______in Beijing start to find ways to preserve historic buildings from destruction.

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问题 Not until the 1980s______in Beijing start to find ways to preserve historic buildings from destruction.
选项 A、some concerned citizens
B、some concerning citizens
C、did some concerning citizens
D、did some concerned citizens
答案D
解析 句首有not until，其后的句子应使用倒装结构。句子表示过去发生的事情，所以应使用一般过去时。所以，应选择D。
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