单项选择题

Britain is ______ European country and China is ______ Asian country.

A．an; an
B．a; a
C．a; an
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单项选择题
My brother told me ______ myself.
A．to look after
B．look after
C．took care of
单项选择题
They didn't stop talking ______ their teacher came back.
A．until
B．while
C．as soon as
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