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【简答题】
合同的订立，必须经过要约和（ ）两个阶段。
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皮皮学刷刷变学霸
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【简答题】This afternoon I was having a PE lesson while I fell down and hurt my foot. I was in greatly pain at that moment, but I tried to act as if nothing has happened until the class was over. Though I had d...