题目内容
16.When a fire happens,the electricity should ______ first.( )A. | be cut down | B. | cut down | C. | be cut off | D. | cut off |
分析 当火灾发生时,必须首先切断电源.
解答 答案是C.本题考查一般现在时的被动语态;cut down削减;cut off切断(供应、联系等),cut off the electricity切断电源;题干中讲述的是一般情况,需要一般现在时;电是"被切断",故需要一般现在时的被动语态,答案是C.
点评 对时态的选择,要在把握时态的基本用法的基础上,根据具体语境和题干中的时间推断时态;同时关注动词的语态,理清不同时态的被动语态的形式以及主语和谓语动词之间的关系,做出合理的判断.
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