A stranger was seen ____ upstairs. He must still be there now.
A.goB.to goC.goingD.gone在线课程B
be seen to do sth.
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A stranger was seen upstairs. He must still be there now.A.goB.to goC.goingD.gone
编辑：chaxungu时间：2026-04-24 12:55:12分类：高中英语题库
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