单项选择题

You can rely on Mr. Smith to carry out this mission for his judgment is always ______.

A．unquestionable
B．healthy
C．sound
D．subtle
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单项选择题
Paul and John work on ______ days.
A．altering
B．alternative
C．alterable
D．alternate
单项选择题
His colleagues were envious ______ his promotion.
A．by
B．of
C．with
D．to
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