eduson ------- many things in his lifetime,all his ------ were very important.〔invent〕
问题描述：
eduson ------- many things in his lifetime,all his ------ were very important.〔invent〕
答
invented
inventions为什么这样填？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。是他过去发明的，用过去时，所以要加ed?正是。