Don’t enter the office unless . A. you have told to B. told toC. tellingD. you are told

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A. you have told to
(答案→)B. told to
C. telling
D. you are told
解析： 考查状语从句的省略。句意：不要进入办公室除非你被告诉进去。根据语境应用told to，前省略了you are，所以选B。