This is one of the happiest days spent in my life.
A. that have ever been
B. that has never been
C. which was ever
D. that had been
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(答案→)A. that have ever been
B. that has never been
C. which was ever
D. that had been
解析：句意：这是我一生中最度过的最开心的一天之一。这个days后面跟一个that引导的定语从句来修饰one of the happiest days，表示最快乐的一天之一,因为先行词被最高级修饰，所以关系代词不能用which，用that，还有当先行词是one of the+ n (pl) 的时候，定语从句中的谓语用动词复数形式，若先行词表示强调的the one /the only one / just the one /the right one则定语从句谓语用单数第三人称形式；所以这题选A。