单项选择题

Have you ever sat ______ late till midnight

A．to
B．for
C．on
D．up
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单项选择题
He just ______ my suggestion at the meeting yesterday.
A．put away
B．shut down
C．showed off
D．brushed aside
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
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