According to the rules of the factory, you mustn’t ask for leave______you have a

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问题 According to the rules of the factory, you mustn’t ask for leave______you have a doctor’s note.

选项 A、unless
B、on condition
C、though
D、until

答案 A

解析 unless意为“如果不，除非”；on condition that意为“如果”；though意为“尽管”；until意为“直到……才”。根据题意选A。

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