单项选择题

Not until all the fish died in the river ______ how serious the pollution was.

A．the villagers realized
B．the villagers did realize
C．did the villagers realize
D．didn't the villagers realize
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单项选择题
Thousands of people took part in the work when the old temple ______.
A．was rebuilding
B．was being rebuilt
C．would be rebuilt
D．had been rebuilt
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