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There are 2 different types of verbs: frequent and irregular. Common verbs variety their previous tense by introducing "ed", when irregular verbs have special previous tense sorts that needs to be memorized.母婴 健康 历史 军事 美食 文化 星座 专题 游戏 搞笑 动漫 宠物 无障�?关怀版The target of e-agriculture is to meet i