单项选择题

A．research engineer
B．auto mechanic
C．sales manager
D．motorbike mechanic
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单项选择题
A．three trains and a busB．three buses and a trainC．three trains and two busesD．three trains and three buses
A．three trains and a bus
B．three buses and a train
C．three trains and two buses
D．three trains and three buses
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