◎ 题干
Since we ____ for almost two weeks, I’ll need to buy a large backpack in advance to carry my supplies of food and water.
A.have walked B.will be walking
C.have been walking D.walked
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“Since we ____ for almost two weeks, I’ll need to buy a large backpack in advance to carry my supplies of food and water.A.have walkedB.will be walkingC.have be…”主要考查了你对  【一般现在时】【将来进行时】【过去完成进行时】【过去将来时的被动语态】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。