单项选择题


A．lain
B．laid
C．lied
D．lay
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单项选择题
A．for the train to startB．the train startingC．the train startD．for the train starting
A．for the train to start
B．the train starting
C．the train start
D．for the train starting
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
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