单项选择题

Mary is _________ a visit _________ China.

A． on... at
B． on... in
C． on... to
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单项选择题
There are about _________ English teachers in our city.
A． two hundred
B． two hundreds
C． two hundred of
单项选择题
The teacher asked _________ you made her a small desk.
A． if
B． that
C． so
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