once （ ）to the rail ,the car will become electricity powered from the system
A.attached B.attaching C.being attached D,having attached
为什么啊
人气：458 ℃ 时间：2020-02-05 13:55:35
解答
A
非谓语动词作状语,与主句主语之间是被动关系,过去分词表示被动的含义
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