单项选择题

A．to track
B．to have tracked
C．tracking
D．being tracked
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单项选择题
A．actB．actionC．demonstrationD．performance
A．act
B．action
C．demonstration
D．performance
单项选择题
What evidence do people from the west give to show that a higher speed limit is safe
A．The long roads between the cities.
B．The modem turbo-charged engine.
C．The economic advantage.
D．The current policies of Germany and Australia.
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