问题标题：
【Youmustreturnthisbooktothelibrarybeforeyouborrowanotherbook同义句Youmustreturnthisbooktothelibrarybeforeyouborrowanotherbook改为同义句You____borrowanotherbook_______youreturnthisbooktothelibrary】
问题描述：
Youmustreturnthisbooktothelibrarybeforeyouborrowanotherbook同义句
Youmustreturnthisbooktothelibrarybeforeyouborrowanotherbook改为同义句You____borrowanotherbook_______youreturnthisbooktothelibrary
高希玉回答：
You_can't___borrowanotherbook__unless_____youreturnthisbooktothelibrary
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