【題目】Please don’t talk in class until you .

A. were told to B. are told to C. were told D. are told

【答案】B

【解析】句意：直到你被要求講，你才能在課堂上講話。Not …until…意為：直到…才…。這里是在描述一條規(guī)則，用一般現(xiàn)在時即可，故排除AC；此句中要表示“你被要求..”，要用被動語態(tài)，這里是tell sb to do的被動形式，即sb be told to do；這里的to后省略了動詞talk；但是這里的to不能省略，故選B。

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