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
人气：137 ℃ 时间：2019-12-14 18:14:44
解答
整句话的意思是：21世纪的生活比以前好过很多.
it used to be在这里是一个修饰成份,也可以说是一个从句,修饰it
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