Can you tell me____the train was invented?A who B when 请问选哪个?

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Canyoutellme____thetrainwasinvented?AwhoBwhen请问选哪个?Canyoutellme____thetrainwasinvented?AwhoBwhen请问选哪

Can you tell me____the train was invented?A who B when 请问选哪个?
Can you tell me____the train was invented?A who B when 请问选哪个?

Can you tell me____the train was invented?A who B when 请问选哪个?
B什么时候火车被发明,选A的话应该有by,被谁发明.

B,指什么时候发明的

when ,
如果选who 应该是 can you tell me who invented the train