◎ 题干
There ________ lots of trees on both sides of this street.But now they are all gone.
A.used to haveB.are used to beC.used to beD.are used to have
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“There ________ lots of trees on both sides of this street.But now they are all gone.A.used to haveB.are used to beC.used to beD.are used to have…”主要考查了你对  【实义动词的单数第三人称形式】【实义动词】【动词短语】  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。