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The pipes have oil or water inside them,...

The pipes have oil or water inside them, which is heated and sent to the storage tank until ______ to produce electricity.

A.needed B.needing

C.to need D.having needed

 

A 【解析】 考查非谓语动词。句意:管道里有油或者水,被加热后被送到储能槽里存储直到需要用来发电时为止。oil or water和need之间是被动关系,所以用过去分词,故选A。
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