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

游客2024-01-18  18

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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