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:无管怎样,然而;unless:如果不,除非,相当于if…not。根据句意可知,D项正确。
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本试题收录于: 英语题库普高专升本分类
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