题目内容

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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