题目内容
12．The light in the room _____________ before you leave．（ ）| A． | must turn off | B． | will turn off | ||
| C． | must be turned off |
分析 房间里的灯，必须/应该在你离开前关上．
解答 答案：C 根据The light in the room _____________ before you leave．可知The light和动词短语turn off构成被动关系，应该用被动语态．故排除A，B．情态动词的被动语态的构成：情态动词+be+及物动词的过去分词，故选：C．
点评 主要考查被动语态，当句子的主语是动作的承受者时，应该用被动语态，本题考查的是情态动词的被动语态．
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