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sunday morning 前面的介词要用什么.如果是moring的话又要用哪个.如果
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询问某事发生的具体时间或者地点时(when , what time, where), when , what time, where), 用一般过去时,如: What time did they arrive? When and where were you born? 比较: Have you see Ann this moring? ( 说话时仍为上午) Did you see Ann t