( )you return those books to the library immediately, you will have to pay a fin

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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

解析本题考查状语从句的用法。not until直到…才；unless除非，如果不；provided后面接句子时要跟引导词that。

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—IsawSaminthelibraryyesterdaymorning.—You______him,heisstillabroad.A