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I wrote a letter to John for his help during my high school

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I wrote a letter to John for his help during my high school years,without which I ________  the college entrance exam.
A.would fail B.would have failed
C.should fail D.must have failed
B

B考察虚拟语气,句义:我给John写了一封信,感谢他在高中给我的帮助,没有他的帮助,我不会通过高考的。句义可知,这是对过去情况的假设,所以主句使用情态动词+have done的形式。故B正确。