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【题目】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
【解析】由句式结构可以看出,空格处应填一个非谓语动词,put...into use与the hotline之间构成逻辑上的动宾关系,所以应该使用过去分词作状语。句意:这条热线于2000年4月投入使用,它专门用于居民报告供水和供热坏了的情况的。根据句意,故选A。

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