12．We must keep the library quiet．（改為被動語態(tài)）
The librarymustbekeptquietbyus．

分析 翻譯：我們必須保持圖書館安靜．圖書館必須被保持安靜．

解答 句中有must，所以采用含有情態(tài)動詞的被動語態(tài)結(jié)構(gòu)：情態(tài)動詞+be+動詞的過去分詞，主動語態(tài)的主語變成賓格由by連接，所以答案為：must be kept by

點評 本題考查含有情態(tài)動詞的被動語態(tài)，平時熟練掌握其結(jié)構(gòu)即可作答．

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