单项选择题


A．and
B．but
C．to
D．or
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单项选择题
A．numbersB．numberC．amountD．quantities
A．numbers
B．number
C．amount
D．quantities
单项选择题
A．only has changedB．only changesC．has only changedD．changed only
A．only has changed
B．only changes
C．has only changed
D．changed only
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