1.The ground is riddled with ice wedges,many quite ancient,caused (by the cold earth cracks) and the cracks filled with water.A.by the cold earth cracking B.when the cold earth cracks.括号内为啥选B不选A?and不是应该并列两个名词嘛?2.
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![1.The ground is riddled with ice wedges,many quite ancient,caused (by the cold earth cracks) and the cracks filled with water.A.by the cold earth cracking B.when the cold earth cracks.括号内为啥选B不选A?and不是应该并列两个名词嘛?2.](/uploads/image/z/15072170-50-0.jpg?t=1.The+ground+is+riddled+with+ice+wedges%2Cmany+quite+ancient%2Ccaused+%28by+the+cold+earth+cracks%29+and+the+cracks+filled+with+water.A.by+the+cold+earth+cracking+B.when+the+cold+earth+cracks.%E6%8B%AC%E5%8F%B7%E5%86%85%E4%B8%BA%E5%95%A5%E9%80%89B%E4%B8%8D%E9%80%89A%3Fand%E4%B8%8D%E6%98%AF%E5%BA%94%E8%AF%A5%E5%B9%B6%E5%88%97%E4%B8%A4%E4%B8%AA%E5%90%8D%E8%AF%8D%E5%98%9B%3F2.)
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