If their oxygen , the two British men a chance of survivingA.ran out, hadB.didn’

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

A.ran out, had

B.didn’t run out, would have

C.had run out, didn’t have

D.hadn’t run out, would have had

试题答案

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。