— Could we practice playing the guitar in the hall, Sir ?                  
—No , ___________ you have the principal’s (校長) note.        
A.ifB.unlessC.becauseD.since
B

試題分析:句意:先生我們能在大廳練習彈鋼琴嗎?不行,除非你有校長的批條。A. if如果B. unless 除非,如果不C. because因為D. since自從……。根據(jù)句意,故選B。
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