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Don’t touth anything unless _______ .
A.to be allowedB.allowedC.to be allowingD.allowed to
B

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。
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