单项选择题

The twins corrected the mistakes on the test papers ______.

A．them
B．themselves
C．him
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单项选择题
Britain is ______ European country and China is ______ Asian country.
A．an; an
B．a; a
C．a; an
单项选择题
There ______ a lot of animals in the zoo.
A．has
B．is
C．are
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