单项选择题

Believe yourself, ______ you"ll get the chance.

A．or
B．and
C．therefore
D．but
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单项选择题
______ I always felt I would through the application, I never thought I would enter Harvard University.
A．Once
B．While
C．If
D．Therefore
单项选择题
Mr. and Mrs. Smith decided to hold a family party to ______ their golden wedding.
A．welcome
B．congratulate
C．memorize
D．celebrate
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