一道高一英语单选____into use in April 2000;the hotline was meant for

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一道高一英语单选
____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.Put.put…into use将…投入使用.the hot line(热线)是在2000年四月被投入使用的,所以用过去分词作状语、表示已经发生的被动动作.putting、having put分别是现在分词的一般式和完成式,都是主动意义.而being done现在分词的被动式表示被动与正在进行,一般置于句首,表示原因.如：Being chased by some spies,he hid himself in the grass. 还可以作后置定语,修饰某一名词,表示某一被动动作正在进行.如：The meeting being held now is of great importance. 现在正在开的会很重要.

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