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

A.WhenB.unlessC.becauseD.if

【答案】B

【解析】

考查連詞。句意：我被教導要靜靜地坐在課堂上不說話除非有人問我問題。A. when當……時候；B. unless除非；C. because因為；D. if如果。根據(jù)句意，除非有人問我問題，在課堂我就安靜地坐著不說話。用unless引導條件狀語從句。故選B。

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