单项选择题

The footsteps of thousands of visitors had ______ the steps.

A．worn on
B．worn off
C．worn out
D．worn away
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单项选择题
My brother has ______ a return ticket for me to go to New York.
A．taken
B．ordered
C．brought
D．booked
单项选择题
The car crashed into a queue of people, ______ were killed.
A．four of whom
B．four of which
C．four of them
D．four of those
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