问题补充：
If their oxygen, the two British mena 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
答案：
A. ran out, had
B. didn’t run out, would have
C. had run out, didn’t have
(答案→)D. hadn’t run out, would have had
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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