单选题 ______ you have written authorization from the Security Department, please do not enter the zone delineated by the green line.

【正确答案】 B

【答案解析】you have written authorization from the Security Department是状语从甸，故横线处应填入从属连词。排除(C)despite。由主句内容可知，“除非您有安全部门的书面许可”的句意最恰当。答案是(B)unless(除非)。