摘要: 本单元出现的被动语态 Who was it / were they invented by? 它是由谁发明的? It was / They were invented by - + sb. 它是由--发明的. When was it / were they invented by? 它是什么时候被发明出来的? It was / They were invented - + time 它是--被发明出来的. What is it / are they used for? 它有什么用途呢? It is / They are used for + doing sth. 它被用来--. 任务Ⅱ. 请用下列词汇编几组特殊疑问句. electric slippers, adjustable heels, tea, microwave ovens, potato chips

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