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
— How do you come to Beijing from Guangzhou — ______.
A． In plane
B． On train
C． By air
单项选择题
______ the end of the story, all the friends got together.
A． At
B． In
C． For
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