You cannot see the doctor______you have made an appointment with him.

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问题 You cannot see the doctor______you have made an appointment with him.

选项 A、except
B、even
C、however
D、unless

答案D

解析 except：除了；even：甚至；however：无论如何，然而；unless：如果不，除非，相当于if…not。根据句意可知，选D。

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