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如何作答(选择)

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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
如何作答(选择)
解题思路: it与that的区别:两词都可代替某一特定名词,但that指同一类,并非同一个。
解题过程:
正确答案是D。it就是life。本句可以理解为life (in the twenty-first century)is much easier than it (life)used to be。

最终答案:略