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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