问题

Overhead railway, whose tracks are elevated out of the way of surface traffic, ______one p

Overhead railway, whose tracks are elevated out of the way of surface traffic, ______one possible solution to heavy traffic in big cities.

A．might be

B．might have been

C．have been

D．should have been

请帮忙给出正确答案和分析，谢谢！

参考答案

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