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Please don't stand up in class until you          .
A.were told toB.are told toC.were toldD.are told
B

试题分析:句意;课堂上,在有人叫你之前,请你不要站起来。结合语境可知下文从句描述的是可观性的动作,故用一般现在时态。主语是动作对象,故用被动语态。Tell后面接带to的不定式做宾语补足语,结合语境可知本句不定式符号不能省略,故选B。
点评:英语中的时态主要是借助于时间状语与上下文语境来进行判断。解答此类题型,首先要注意句子中的时间状语,如果没有则要通过分析上下文,结合语境来判断句子的时态。语态的判断主要是确定句子主语与谓语动词的关系。如果是主动关系则用主动语态,反之如果是动宾关系,则用被动语态,尤其要注意一些特殊动词的用法。注意一些用不定式做宾语补足语的动词用作被动语态时,不定式符号to要加上。
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