单项选择题

— I'm sorry I stepped outside for a smoke. I was very tired.
— There is no ______ for this while you are on duty.

A. reason
B. excuse
C. cause
D. explanation
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单项选择题
I went to bed very late that night, ______, early the next morning.
A. at least
B. in a word
C. or rather
D. at most
单项选择题
It is certain that he will ______ his business to his son when he gets old.
A. take over
B. think over
C. hand over
D. go over
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