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,沒有被動(dòng)語態(tài)。if如果,從句用一般現(xiàn)在時(shí)表將來,主句用一般將來時(shí)。因此,選C。
考點(diǎn):考查if從句的用法。

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