Don’t touth anything unless _______ .
A．to be allowedB．a(chǎn)llowedC．to be allowingD．a(chǎn)llowed to
B

試題分析：句意：不要觸摸任何的東西除非被允許。這里用了狀語從句的省略。完整的句子是：unless you are allowed to touch，當主從句的主語一致的時候，可以省略從句的主語和be動詞，選B。
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