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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 1584

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
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Thepipeshaveoilorwaterinsideth