单项选择题

A．to
B．for
C．as
D．since
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单项选择题
A．have beenB．would have beenC．could have beenD．should have
A．have been
B．would have been
C．could have been
D．should have
单项选择题
A．in partB．in segmentC．in proportionD．in relation
A．in part
B．in segment
C．in proportion
D．in relation
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