I wrote a letter to John for his help during my high school years. without which Ithe coll

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A. would fail
(答案→)B. would have failed
C. should fail
D. must have failed
解析：考查虚拟语气。本题考查了含蓄的虚拟语气，该条件是通过介词without要不是…；如果没有…来表现出来的。根据wrote说明本句是与过去事实相反的虚拟语气，故使用“情态动词+have done”的结构来表示与过去事实相反的虚拟语气。故B正确。