问题
选择题
_____ 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
答案
答案：A
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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
答案：A