单项选择题

A．or
B．but
C．and
D．nor
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单项选择题
A．slightlyB．heavilyC．publiclyD．gradually
A．slightly
B．heavily
C．publicly
D．gradually
单项选择题
A．whichB．on whichC．at whichD．in which
A．which
B．on which
C．at which
D．in which
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