单项选择题

A．with
B．from
C．in
D．on
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单项选择题
A．differencesB．variablesC．alternativesD．separations
A．differences
B．variables
C．alternatives
D．separations
单项选择题
Some students at the university explain that they have no time to ______ athletic activities.
A．engage in
B．come up to
C．specialize in
D．take advantage of
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