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

Aasking Basked

Cbeing asked Dhaving asked

 

B

【解析】B 連詞省略句。該句中的unless引導(dǎo)的條件狀語從句的主語是the pupils,與主句的主語相同,the pupilsask之間是被動關(guān)系,應(yīng)該使用過去分詞的形式。故B正確。

 

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