Then another form of bike with two wheels of the same size was invented(为社么invented加ed)
题目
Then another form of bike with two wheels of the same size was invented(为社么invented加ed)
答案
这是表被动.be done .被发明,be invented.
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我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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