单项选择题

______ you return those books to the library immediately you will have to pay a fine.

A．Until
B．Unless
C．If
D．Provided
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单项选择题
The more (frequent) the child expresses his (interest) in (an) activity, the stranger (it) will become.
A．frequent
B．interest
C．an
D．it
单项选择题
Don't you know he is an old friend of ______
A．my brother
B．my brothers
C．my brother's
D．my brother's friend
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