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

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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?
• 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
• 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
• 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 ________.life is much easier than (it) was in the 20 centry求两个句子具体分析和对比life in the twenty-first century is much easier than it used to be