我觉得有必要先给你区分一下现在完成时和一般过去时：前者表示过去发生的某一动作对现在造成的影响或结果，强调的是现在的情况；而后者只表示过去的动作或状态，和现在不发生联系。A2：打扫房间只表示过去的动作，没有对现在造成影响。故用did.还有一点，现在完成时不能和表示过去的时间状语连用。an hour ago.一小时前，为过去的时间故用did....
关于英语语法问题,请分析下一段对话：A:Have you already cleaned the room?B:Yes,
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