单项选择题

Now it is important that our drinking water ______ purified.

A．should be
B．is
C．will be
D．was
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单项选择题
The picture, ______ she paid ＄ 5, 000, was once owned by an old artist.
A．in that
B．for which
C．which
D．at which
单项选择题
Although I have lived in this country for just three months, I ______ the food there.
A．used to eating
B．am used to eat
C．am used to eating
D．used to eat
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