◎ 题干
Thanks to the old man’s hard work, a lot of _____ has been covered with green trees.
A.the hillsB.hillsC.the hillD.hill
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“Thanks to the old man’s hard work, a lot of _____ has been covered with green trees.A.the hillsB.hillsC.the hillD.hill…”主要考查了你对  【可数名词及其单复数】【集合名词】【名词】  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。