题目内容
______ 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
【详解】本题考测分词作状语。分词所表示的动作对于逻辑主语the hotline来说是被动的。 所以用过去分词put。 Put into… 在这里相当于When the hotline was put into use in April 2000.
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