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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