单项选择题

His colleagues were envious ______ his promotion.

A．by
B．of
C．with
D．to
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单项选择题
A few simple ______ to this plan would greatly improve it.
A．demands
B．modifications
C．modulations
D．assessments
单项选择题
Today, housework has been made much easier by electrical ______.
A．appliances
B．facilities
C．instruments
D．equipments
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