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
______ is announced in today's papers, all the schools will open on September 1.
A. This
B. That
C. As
D. Which
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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