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题目内容双击单词支持查询和收藏哦～
To compensate for the substantial decline in the availability of fossil fuels in future years, we will have to provide at least _____ alternative energy source.
- A.an anticipated
- B.an official
- C.an equivalent
- D.a derivative
- E.a redundant
C显示答案
以上解析由 考满分老师提供。
