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

試題分析：句意：如果我們不節(jié)約能源，有一天會用完的。run out用光，用完，沒有被動語態(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。
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