______you return those books to the library immediately you will have to pay a fine.

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问题 ______you return those books to the library immediately you will have to pay a fine.

选项 A、Until
B、Unless
C、If
D、Provided

答案B

解析状语从句题。pay a fine“交罚款”。根据句意判断，前后句为假设关系，“如果不……就会……”，unless意为“除非，如果不”，符合题意。provided“倘若……，只要”，until“直到”，if“如果”，A、C和D都和句意相反。因此答案为B。

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专业英语四级

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