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

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

admin2013-05-19  73
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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大学英语四级

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