单项选择题

A．thesis
B．object
C．target
D．objective
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单项选择题
A．playersB．athletesC．runnersD．contestants
A．players
B．athletes
C．runners
D．contestants
单项选择题
A．to trackB．to have trackedC．trackingD．being tracked
A．to track
B．to have tracked
C．tracking
D．being tracked
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