Question

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

A．if

B．unless

C．because

D．since

Answer 1

B

解析試題分析：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……。根據句意，故選B。
考點：考查連詞的用法。