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When I came into the room, he was writing a letter.当我进屋时，他正在写信。 We shall go there whenever we are free.我们什么时间有空，我们就去那里。
I was walking along the street when suddenly someone patted me on the shoulder from behind.我正在街上走着，这时忽然有人从后面拍我的肩膀。
I was walking along the street when suddenly someone patted me on the shoulder from behind.我正在街上走着，这时忽然有人从后面拍我的肩膀。
