题目内容
— Could we practice playing the guitar in the hall, Sir ?
—No , ___________ you have the principal’s (校长) note.
| A．if | B．unless | C．because | D．since |
B
解析试题分析：句意：先生我们能在大厅练习弹钢琴吗？不行，除非你有校长的批条。A. if如果B. unless 除非，如果不C. because因为D. since自从……。根据句意，故选B。
考点：考查连词的用法。
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