题目内容
________ into use in April 2000, the hotline was meant for residents reporting water and heating supply break-downs.
[ ]
A.Put
B.Putting
C.Having put
D.Being put
答案:A
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题目内容
________ into use in April 2000, the hotline was meant for residents reporting water and heating supply break-downs.
A.Put
B.Putting
C.Having put
D.Being put