题目内容
例____ 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
A
解析:
put sth. into use “让……投入使用”。显然,put 和句子主语the hotline 构成被动关系,所以用表示被动的过去分词。
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