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______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
解题思路:
解题过程:
选项B.是现在分词表主动,不合题意,C。是完成时,也不表示被动意思。D是进行时的被动语态,于后面的时间状语不符,所以选A.
最终答案:略