What shall human beings do if oil        sometime in the future?

A．will run outB．runs out of C．runs outD．will be run out

C

解析試題分析：考查時(shí)態(tài)。在條件狀語從句中用一般現(xiàn)在時(shí)代替將來時(shí)。固定詞組run out用完，耗盡；該短語沒有被動(dòng)語態(tài)；run out of sth用完某物；該短語有被動(dòng)語態(tài)的形式。句意：如果未來石油用完了，我們?nèi)祟悤?huì)用什么呢？故C正確。
考點(diǎn)：考查時(shí)態(tài)
點(diǎn)評：時(shí)態(tài)題的考查關(guān)鍵是抓住句子的上下文含義和句中的時(shí)間狀語。要根據(jù)時(shí)間狀語來選擇合適的時(shí)態(tài)，在平時(shí)的學(xué)習(xí)中要注意積累有關(guān)時(shí)態(tài)的用法和各種時(shí)態(tài)的特殊之處。如since， so far等經(jīng)常與現(xiàn)在完成時(shí)連用。在條件狀語從句中用一般現(xiàn)在時(shí)代替將來時(shí)等等。

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