单项选择题

She was glad to see her children well ______ in the nursery.

A．take care of
B．taken care of
C．taking care of
D．to be taken care of
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单项选择题
The machine is such ______ I have never seen before.
A．that
B．as
C．which
D．where
单项选择题
The price of oil ______ from $15 to $18 per tank during the winter season.
A．ranged
B．differed
C．altered
D．separated
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