问题: 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.
这道题到底用A还是用D答案呢？谢谢各位高手
解答:
D
life in the twenty-first centry is much easier than it used to be.
life in the twenty-first centry is much easier than that in the twentieth.
原因我说不上来，只是感觉，但是不会错。以上两句你比较，都是正确的句子。
English can be learnt. It cannot be studied.
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