单项选择题

He was so engaged ______ his business that he hadn't been home for a month.

A．at
B．on
C．for
D．in
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单项选择题
______ the punishment was unfair, he accepted it without complaint.
A．Since
B．While
C．As long as
D．Even though
单项选择题
The reason ______ I can't come is that my mother is ill
A．because
B．why
C．as
D．for
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