【題目】The pipes have oil or water, which is heated and sent to the storage tank until to produce electricity.

A. needed B. needing

C. to need D. having needed

【答案】A

【解析】

試題分析：考察時間狀語從句中的省略。當狀語從句的主語與主句的主語一致時，可以省略狀語從句的主語和系動詞be 。將省略還原該句應(yīng)該是sent to the storage tank until（it is）needed to produce electricity.句意：該管道內(nèi)有油或者水，直到需要發(fā)電時，其才會被加熱并送入存儲罐中。

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