once（）totherail,thecarwillbecomeelectricitypoweredfromthesystemA.attachedB.attachingC.beingattachedD,havingattached为什么啊
<p>问题：once（）totherail,thecarwillbecomeelectricitypoweredfromthesystemA.attachedB.attachingC.beingattachedD,havingattached为什么啊<p>答案：↓↓↓<p class="nav-title mt10" style="border-top:1px solid #ccc;padding-top: 10px;">施隆照的回答：<div class="content-b">网友采纳 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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