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


  1. A.
    will run out
  2. B.
    runs out of
  3. C.
    runs out
  4. D.
    will be run out
C
解析：

試題分析：考查時態(tài)。在條件狀語從句中用一般現(xiàn)在時代替將來時。固定詞組run out用完，耗盡；該短語沒有被動語態(tài)；run out of sth用完某物；該短語有被動語態(tài)的形式。句意：如果未來石油用完了，我們人類會用什么呢？故C正確。
考點：考查時態(tài)
點評：時態(tài)題的考查關鍵是抓住句子的上下文含義和句中的時間狀語。要根據(jù)時間狀語來選擇合適的時態(tài)，在平時的學習中要注意積累有關時態(tài)的用法和各種時態(tài)的特殊之處。如since， so far等經常與現(xiàn)在完成時連用。在條件狀語從句中用一般現(xiàn)在時代替將來時等等。
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