单项选择题


A．for the train to start
B．the train starting
C．the train start
D．for the train starting
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单项选择题
A．had been workingB．have been workingC．workedD．have worked
A．had been working
B．have been working
C．worked
D．have worked
单项选择题
A．knowB．knewC．have knownD．had known
A．know
B．knew
C．have known
D．had known
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