______you have written authorization from the Security Department, please do not enter the zone delineated by the green line.

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问题 ______you have written authorization from the Security Department, please do not enter the zone delineated by the green line.

选项 A、Because
B、Unless
C、Despite
D、Whereas

答案B

解析 you have written authorization from theSecurity Department是状语从句,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)。
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