If their oxygen , the two British men a chance of surviving.A．ran out, h
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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 |
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答案
| D |
解析
| 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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