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

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

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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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