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

解析試題分析：句意：如果我們不節(jié)約能源，有一天會(huì)用完的。run out用光，用完，沒(méi)有被動(dòng)語(yǔ)態(tài)。if如果，從句用一般現(xiàn)在時(shí)表將來(lái)，主句用一般將來(lái)時(shí)。因此，選C。
考點(diǎn)：考查if從句的用法。

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