单项选择题

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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单项选择题
In the dark they could not see anything clear, but could ______.
A．hear somebody mourn
B．hear somebody mourning
C．hear somebody mourned
D．hear somebody had been mourning
单项选择题
The beauty of the reflected images in the limpid pool was the poignant beauty of things that are ______, existing only until the sunset.
A．equitable
B．ephemeral
C．euphonious
D．evasive
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