题目内容
17.It's said that most traffic lightsare controlled (control) by a central computer.分析 据说大多数交通灯由一台中央计算机控制.
解答 答案:are controlled 根据most traffic lights___(control) by a central computer.可知这句话的主语是traffic lights,是动作的承受者,它和动词control构成被动关系,所以应该用被动语态.根据据说大多数交通灯由一台中央计算机控制.可知,是说的现在的情况,应该用一般现在时.一般现在时的被动语态的构成:am/is/are+及物动词的过去分词.主语lights是复数,故填:are controlled.
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,本题考查的是一般现在时态的被动语态.一定注意其构成形式,一般现在时的被动语态的构成:am/is/are+及物动词的过去分词.
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