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eduson ------- many things in his lifetime,all his ------ we

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eduson ------- many things in his lifetime,all his ------ were very important.〔invent〕
invented
inventions
再问: 为什么这样填?
再答: 第一空填动词,爱迪生一生发明了很多东西。 第二空填名词复数,他所有的发明都很重要。
再问: 是他过去发明的,用过去时,所以要加ed ?
再答: 正是。