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 空格处应该填入个冠词+形容词的结构,来修饰后面的能源替代方案。A项“预期的,期望的”;B项“官方的,正式的,公务的”;C项“等价的,相等的,同意义的”;D项“多余的,过剩的,被解雇的,失业的,冗长的”。句意为:为了弥补未来的几年中化石燃料供应量的大幅度下降,我们将不得不提供种至少是(同等的)替代能源。故答案为C。
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