◎ 题干
_________ trees have been planted these years.
A.Million B.Millions C.Million of D.Millions of
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“_________ trees have been planted these years.A.MillionB.MillionsC.Million ofD.Millions of…”主要考查了你对  【基数词】【序数词】【时刻】【分数】  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。