单项选择题

— Can I speak to Mr. Liu. Please
— Sorry but he's busy ______ his guests now.

A．to meet
B．with
C．meeting
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单项选择题
— Who can tell me the answer ______ this question
A．about
B．of
C．to
单项选择题
Come on, boys and girls! It's time to go ______ bed!
A．to
B．for
C．/
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