______ you return those books you have borrowed to the library immediately you w

游客2023-09-27 46

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

选项 A、Until
B、Provided
C、If
D、Unless

答案 D

解析 unless=if...not

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Thesilenceofthelibrary________onlybythesoundofpagesbeingturnedover.A