单项选择题

The dictionary will prove ______ to you in your English study.

A．being of some use
B．be of some use
C．to be of some use
D．of some use
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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
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
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