系列之四:D类

单选题Not until the 1980’s ______ in Beijing start to find ways to preserve historic buildings from destruction.A some concerned citizensB some concerning citizensC did some concerning citizensD did some concerned citizens

题目
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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