问题
选择题
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
答案
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。