单项选择题

His laziness ______ his failure in the final exam,

A．gave up
B．contributed
C．resulted in
D．distributed
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单项选择题
A great many cancers can be cured but only if ______ before they have begun to spread or colonize in other parts of the body.
A．properly treat
B．properly treating
C．being properly treated
D．properly treated
单项选择题
I would like to take this opportunity to express my sincere ______ of your help.
A．appreciation
B．appearance
C．preparation
D．appointment
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