into use in April 2000, the hotline was meant for residents reporting water and heating s

发布时间：2020-08-15 03:03:38

     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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(答案→)A. Put
B. Putting
C. Having put
D. Being put
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