单项选择题

A．Falling down.
B．Missing the bus.
C．Taking a trip.
D．Fixing his shoe.
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单项选择题
A．Passenger and bus driver.B．Doctor and nurse.C．Sales clerk and customer.D．Airline agent and customer.
A．Passenger and bus driver.
B．Doctor and nurse.
C．Sales clerk and customer.
D．Airline agent and customer.
单项选择题
A．Some people sometimes.B．Nobody.C．Everybody.D．Some people all the time.
A．Some people sometimes.
B．Nobody.
C．Everybody.
D．Some people all the time.
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