单项选择题

He was busy writing the essay all the morning, only ______ occasionally to have a cup of te

A． breaking offB. breaking outC. breakingD. breaking away
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单项选择题
The picnic ______ at last after being twice postponed.
A．came off
B．came up
C．put on
D．went on
单项选择题
The last guests to reach the hotel ______ at 12 o'clock at night.
A．checked out
B．checked up
C．checked in
D．check on
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