单项选择题

Please pay attention ______ what I say.

A． to
B． at
C． of
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单项选择题
I've been waiting for him for ______ hour and ______ half.
A． a.../
B． an... a
C． an.../
单项选择题
Be careful ______ your health.
A． except
B． of
C． to
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