___ they plant trees in this area every year,the tops of some hills are still bare.

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• ___ they plant trees in this area every year,the tops of some hills are still bare.
• 1:Although they plant trees in this area every year,the tops of some hills are still___.
• ___ they plant trees in this area every year,the tops of some hills are still bare.A.Although B.Unless C.Since D.Once
• although they plant trees in this area every year,the tops of some hills are still__.A.blank.B.vacant C.bare
• Although they plant trees in this area every year,the top of some hills are still___.Although they plant trees in this area every year,the top of some hills are still___.A.blankB.hollowC.vacantD.bare请陈述理由
• although they plant trees in this area every year,the tops of some hills are still__.
• Although they plant trees in this area every year,the top of some hills are still___.
• 已知a/b=1/3,则（a的平方减2ab减b的平方）除以（a的平方减3ab加b的平方）
• 英语中 一般情况：形容词 后面加 -ly 成为 副词,这里 -ly 有无什么说法或者来源?