题目内容
Don’t touth anything unless _______ .
| A．to be allowed | B．allowed | C．to be allowing | D．allowed to |
B
解析试题分析：句意：不要触摸任何的东西除非被允许。这里用了状语从句的省略。完整的句子是：unless you are allowed to touch，当主从句的主语一致的时候，可以省略从句的主语和be动词，选B。
考点：考查状语从句的省略
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