题目内容
12．The twins ate up all the bananas on the plate．（改为被动语态）All the bananas on the platewereeatenup by the twins．
分析 这对双胞胎吃光了盘子里所有的香蕉．
盘子里所有的香蕉都被这对双胞胎吃光了．
解答 答案：were eaten．原句的ate是动词eat吃的过去式，下文的主语All the bananas是动词eat的承受者，构成被动关系，结合时态用一般过去时的被动语态was/were+过去分词，主语是复数，故were，eat的过去分词是eaten．故答案是were eaten．
点评 一般过去时的被动语态was/were+过去分词的呈现，各种类型的被动语态的构成要理解掌握．
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