题目列表(包括答案和解析)
| ______ into use in April 2000，the hotline was meant for residents reporting water and heat supply breakdowns. A．Put B．Putting C．Having put D．Being put |
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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