单项选择题

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

A．the villagers realized
B．did the villagers realize
C．the villagers did realize
D．didn't the villagers realize
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单项选择题
Taxi drivers often remind passengers to ______ their belongings when they leave the car.
A．hold
B．catch
C．grasp
D．collect
单项选择题
We wanted to get home before dark, but it didn't ______ as we planned.
A．turn out
B．go on
C．make out
D．come up
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