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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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
单项选择题
— How do you come to Beijing from Guangzhou — ______.
A． In plane
B． On train
C． By air
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