I wrote a letter to John for his help during my high school years，without which I ________  the college entrance exam.
A．would failB．would have failed
C．should failD．must have failed
B
B考察虛擬語氣，句義：我給John寫了一封信，感謝他在高中給我的幫助，沒有他的幫助，我不會通過高考的。句義可知，這是對過去情況的假設(shè)，所以主句使用情態(tài)動詞+have done的形式。故B正確。
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