______ you return those books to the library immediately, you will have to pay a

游客2024-10-29  1

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

选项 A、Until
B、If
C、Unless
D、Provided

答案 C

解析 unless作连词引导条件状语从句,相当于if not,意为“除非……;如果不……,就会……”,主句多为否定句,如:Jane won’t pass chemistry test unless she works hard.除非简努力学习,否则她就不会通过化学考试。
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