【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(shí)間狀語(yǔ)從句中的省略。當(dāng)狀語(yǔ)從句的主語(yǔ)與主句的主語(yǔ)一致時(shí)，可以省略狀語(yǔ)從句的主語(yǔ)和系動(dòng)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(shí)，其才會(huì)被加熱并送入存儲(chǔ)罐中。

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