题文
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 |
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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 |
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