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
C
be lost in表示“沉浸在------中”,过去分词作原因状语。

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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
C
be lost in表示“沉浸在------中”,过去分词作原因状语。