that 和 it 代不可数名词区别在哪里
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？
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？
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