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If their oxygen     , the two British men     a chance of surviving.
A.ran out, hadB.didn’t run out, would have
C.had run out, didn’t haveD.hadn’t run out, would have had
D
考查时态。句意:如果他们的氧气已经耗尽,这两个英国人应该有一个幸存的机会。结合语境可知从句描述的是过去已经完成的动作,故用过去完成时态。表示对过去本来能够做某事而没有做事情的假设,用“could+have+done”,故选D。
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