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The old man with his son_______the street carefully when the

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The old man with his son_______the street carefully when the traffic light was red.
A.were crossing B.crossed C.across
The old man with his son_______the street carefully when the
The old man with his son (A.were crossing) the street carefully when the traffic light was red.
当红灯亮时,那位老人正和他的儿子一起小心地过马路.
时间状语为when引导的过去时,主句为过去进行时态,表示过去某个特定时间正在发生的事情.
再问: 答案是C
再答: 这个所谓的答案肯定是错的了。across是个介词,而这里应该是填个动词作为句子的谓语。选择C项太离谱了。