In my opinion,life in the twenty-first century is much easier than ________.

In my opinion,life in the twenty-first century is much easier than ________.

题目
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》?
答案
因为这里有“life”.这个词很特别,要用it指代.例:life is not as it used to be hard traffic ,hight prices ,people always become angry all the time ,we need to go to live on the moon
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已知函数f(x)=x,g(x)=alnx,a∈R.若曲线y=f(x)与曲线y=g(x)相交,且在交点处有相同的切线,求a的值和该切线方程.
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