If their oxygen     , the two British men     a chance of surviving


  1. A.
    ran out, had
  2. B.
    didn’t run out, would have
  3. C.
    had run out, didn’t have
  4. D.
    hadn’t run out, would have had
D
考查時態(tài)。句意：如果他們的氧氣已經(jīng)耗盡，這兩個英國人應(yīng)該有一個幸存的機會。結(jié)合語境可知從句描述的是過去已經(jīng)完成的動作，故用過去完成時態(tài)。表示對過去本來能夠做某事而沒有做事情的假設(shè)，用“could+have+done”，故選D。
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