Question

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

A．asking B．asked

C．being asked D．having asked

 

Answer 1

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 pupils与ask之间是被动关系，应该使用过去分词的形式。故B正确。