题文
____ into use in April 2000, the hotline was meant for residents reporting water and heating supply breakdowns.
| A．Put |
| B．Putting |
| C．Having put |
| D．Being put |
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____ into use in April 2000, the hotline was meant for residents reporting water and heating supply breakdowns.
| A．Put |
| B．Putting |
| C．Having put |
| D．Being put |
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