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If we don’t save energy, it _____ some day.

A.will be run outB.has been run out
C.will run outD.has run out

C

解析试题分析:句意:如果我们不节约能源,有一天会用完的。run out用光,用完,没有被动语态。if如果,从句用一般现在时表将来,主句用一般将来时。因此,选C。
考点:考查if从句的用法。

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