题目内容
12.We must keep the library quiet.(改为被动语态)The librarymustbekeptquietbyus.
分析 翻译:我们必须保持图书馆安静.图书馆必须被保持安静.
解答 句中有must,所以采用含有情态动词的被动语态结构:情态动词+be+动词的过去分词,主动语态的主语变成宾格由by连接,所以答案为:must be kept by
点评 本题考查含有情态动词的被动语态,平时熟练掌握其结构即可作答.
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