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【练一练 ➡ 活学活用】 1. ①A troop of boys were playing __ ___ ____ __ a pond. 一群男孩正在池塘边玩耍。 ②She carefully positioned the cup ___ ___ ____ __ the shelf. 她把杯子小心地放在架子边缘。 ③He was found three days later ___ ___ ____ __ death in his room. 三天之后他在自己的房间里被发现, 已濒于死亡。
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