In my opinion, life in the twenty-first century is much easier than ____.
| A．what used to be | B．that it used to be |
| C．it used to be | D．what it used to be |
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In my opinion, life in the twenty-first century is much easier than ____.
| A．what used to be | B．that it used to be |
| C．it used to be | D．what it used to be |
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