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

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