单项选择题

A．have been
B．would have been
C．could have been
D．should have
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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
单项选择题
A．on toB．onC．forD．against
A．on to
B．on
C．for
D．against
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