单项选择题

This book should be returned to the library ______ the end of this month.

A．by
B．from
C．in
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______ it ts raining, ______ no one leaves the sports ground.
A．Because; /
B．Although; /
C．Although; but
单项选择题
--This is ______ useful book, I think.-- So it is, and it's ______ unusual one.
A．a; a
B．a; an
C．an; an
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