2. 外语
  3. To compensate for the substantial decline in the availability of fossil fuels in future years, we will have to provide at least_

To compensate for the substantial decline in the availability of fossil fuels in future years, we will have to provide at least_

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问题 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.
选项 A、an anticipated
B、an official
C、an equivalent
D、a redundant
答案C
解析 空格应该填入一个“冠词+形容词”的结构，来修饰后面的能源替代方案。A预期的，期望的；B官方的，正式的，公务的；C等价的，相等的，同意义的；D多余的，过剩的，被解雇的，失业的，冗长的。句意为：为了弥补未来几年中矿物燃料供应量的大幅度下降，我们将不得不提供一种至少是(同等的)替代能源。故答案为C。
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