Unless ________ to answer questions, the pupils won't talk in Mrs Smith's class.
A．a(chǎn)skingB．a(chǎn)sked
C．being askedD．having asked
B
B 連詞省略句。該句中的unless引導的條件狀語從句的主語是the pupils，與主句的主語相同，the pupils與ask之間是被動關系，應該使用過去分詞的形式。故B正確。
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