You may keep the book a further week______no one else requires it.

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问题 You may keep the book a further week______no one else requires it.

选项 A、lest
B、provided
C、unless
D、until

答案B

解析 如果没有人要这本书,你就可以再用一个星期。provided引导条件状语从句,意为“假若,倘若”。lest“以免”,后面的句子谓语用should+动词原形。
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