I was taught to sit quietly in class and...

I was taught to sit quietly in class and not to speak______ someone asked me a question.

A.When B.unless C.because D.if

B 【解析】考查连词。句意：我被教导要静静地坐在课堂上不说话除非有人问我问题。A. when当……时候；B. unless除非；C. because因为；D. if如果。根据句意，除非有人问我问题，在课堂我就安静地坐着不说话。用unless引导条件状语从句。故选B。

考点分析：

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