______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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