Unless ________ to answer questions, the pupils won"t talk in Mrs Smith"s class
题型：不详难度：来源：
Unless ________ to answer questions, the pupils won"t talk in Mrs Smith"s class.| A．asking | B．asked | | C．being asked | D．having asked |
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答案
| 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。 |
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