单项选择题

He is ______ tearing up what he has written and beginning over again.

A．simply
B．constantly
C．gradually
D．generally
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单项选择题
As a policeman, Mr. Brown thought that he had a duty to ______ the lost children in finding their homes.
A．assist
B．help
C．provide
D．support
单项选择题
The book you want is not ______ now. I will let you know as soon as it is returned to the library.
A．useful
B．possible
C．available
D．practical
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