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Unless ________ to answer questions, the pupils won't talk in Mrs Smith's class.

Aasking Basked

Cbeing asked Dhaving asked

 

B

【解析】B 连词省略句。该句中的unless引导的条件状语从句的主语是the pupils,与主句的主语相同,the pupilsask之间是被动关系,应该使用过去分词的形式。故B正确。

 

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