life in the twenty-first century is much easier than it used to be.中的it used to be 是做什么成分

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• 一个很难的高中英语单选题----高手帮忙In my opinion, life in the twenty-first century is much easier than _____ .A：that used to be B：it is used to C：it was used to D：it used to be答案是D,但是我看不懂D项,it是代指life的对吗?重点说一下it used to be 后面是不是省略了东西?如果是完整的,我怎么也理解不了,怎么可能以be结尾呢?
• 一个很难的高中英语单选题----高手帮忙In my opinion,life in the twenty-first century is much easier than _____ .A：that used to be B：it is used to C：it was used to D：it used to be但是我看不懂D项,it used to be 后面是不是省略了东西?it代指什么.used to be 分词短语作it的后置定语吗？
• 一个高中英语句子的结构分析--------此题很难,In my opinion,life in the twenty-first century is much easier than it used to be.我重点想知道最后的it used to be是不是省略了什么?如果是的话,请补充完整.并标准翻译.
• that 和 it 代不可数名词区别在哪里in my opinion,life in the twenty-first centry is much easier than————A that used to be .B.it is used to.C.it was used to D.it used to be.选D是为什么呢？为什么A就不行呢？
• In my opinion,life in the twenty-first century is much easier than_______.A.that used to be B.it used to be我觉得应该选B,但是答案选的是A.这是个什么从句啊?为什么be后面不加that作表语呢?对不起，我打错了。应该是In my opinion,life in the twenty-first century is much easier than_______.A.that used to be B.it used to be我觉得应该选A，但是答案选的是B。这是个什么从句啊？为什么be后面不加that作表语呢？
• life in the twenty-first century is much easier than it used to be.中的it used to be 是做什么成分
• in my opinion life in the 21st century is much easier than（）In my opinion,life in the twenty-first century is much easier than ________.A.that used to be B.it is used to C.it was used to D.it used to be 为什么不选A,that不也可指代么?我学比较级的时候用来代指天气等不可数名次都用that啊 怎么这个不是呢》?
• 1.In my opinion,life in the twenty-first century is much easier than ________.A.that used to be B.it is used to C.it was used to D.it used to be 2.The information on the Internet gets around much more rapidly than_____in the newspaper.A.that B.those C.one D.it1 不能用that 只能用it 而 2 只能用that 不能用it,看起来区别不大有人说life 这个词特殊,是这个原因吗?我刚刚才注册没啥分,
• life in the twenty-first century is much easier than it used to be.中的it used to be 是做什么成分不太懂这些东西
• wind can be used to generate electricity这句话为什么有两个助动词?
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