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

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

选项 A、might be
B、might have been
C、have been
D、should have been

答案A

解析 本题考查情态动词的用法,题意为,轨道被提高、远离地面交通的高架铁路,可能是(解决)大城市交通堵塞的一个可行办法。本题表示对事物的推测。
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