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．three week’s workB．three weeks’ worksC．three weeks’ workD．three week’s works
A．three week’s work
B．three weeks’ works
C．three weeks’ work
D．three week’s works
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