单项选择题

A) to C) by
B) about D) with

A．to
B．about
C．by
D．with
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单项选择题
A) within C) forB) during D) by
A．within
B．during
C．for
D．by
单项选择题
A) remaining C) providedB) existing D) available
A．remaining
B．existing
C．provided
D．available
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