单项选择题

Paul and John work on ______ days.

A．altering
B．alternative
C．alterable
D．alternate
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单项选择题
His colleagues were envious ______ his promotion.
A．by
B．of
C．with
D．to
单项选择题
A few simple ______ to this plan would greatly improve it.
A．demands
B．modifications
C．modulations
D．assessments
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