单项选择题

A country must always be ______ guard against spies and invaders.

A．in
B．to
C．with
D．on
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单项选择题
One must try his best to ______ to the new environment.
A．adopt
B．adapt
C．adept
D．apt
单项选择题
Christmas is a holiday usually celebrated on December 25th ______ the birth of Jesus Christ.
A．in accordance with
B．in terms of
C．in favor of
D．in honor of
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