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？
人气：405 ℃ 时间：2020-04-18 13:30:30
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.
