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18.I cleaned my teeth twice before I got to bed last night.(变被动语态)My teeth were cleaned twice before I got to bed last night..

分析 昨晚上床睡觉前我刷了两次牙.
昨晚上床睡觉前,我的牙齿刷了两次.

解答 答案:My teeth were cleaned twice before I got to bed last night.my teeth是动词clean的承受者,够成被动关系,结合时态一般过去时用一般过去时的被动语态was/were+过去分词,主语my teeth复数,故were,clean的过去分词cleaned,故答案是My teeth were cleaned twice before I got to bed last night.

点评 一般过去时的被动语态was/were+过去分词的呈现,课下要理解记忆各种被动语态的构成.

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