单项选择题


A．It is
B．Because of
C．Due to
D．Given
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单项选择题
A．whichB．thatC．thoseD．they
A．which
B．that
C．those
D．they
单项选择题
A．been used toB．used toC．been used forD．used for
A．been used to
B．used to
C．been used for
D．used for
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