单项选择题

One more try, ______ you will succeed.

A．or
B．but
C．so
D．and
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单项选择题
With all its advantages, the computer is by no means without its ______.
A．boundaries
B．restraints
C．confinements
D．limitations
单项选择题
He gave a brief ______ of the history of the university before the opening of the conference.
A．reference
B．statement
C．account
D．comment
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