单项选择题

A．Passenger and bus driver.
B．Doctor and nurse.
C．Sales clerk and customer.
D．Airline agent and customer.
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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.
单项选择题
A．The milk had gone bad.B．The milk hadn’t turned sour.C．The man had put away the milk.D．The man had drunk the milk.
A．The milk had gone bad.
B．The milk hadn’t turned sour.
C．The man had put away the milk.
D．The man had drunk the milk.
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