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

问题补充：

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

Awould fail

B. would have failed

C. should fail

D. must have failed

答案：

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。