↑ 收起筛选 ↑
试题详情

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

高三英语单项填空中等难度题

少年,再来一题如何?
试题答案
试题解析
相关试题