主干是even an end may be pursued unwisely
修饰end的定语从句是which it would be noble to pursue
两个if引导的都是条件状态从句
it肯定不能去掉,因为它在从句中作形式主语,真正的主语是to pursue which,which在这里代替end
如果某个目标有实现的可能而去为之拼搏是件高尚的事,如果实现的可能性为零仍去拼搏就是个愚蠢（鲁莽）的行为.
请楼下朋友指正.
even an end which it would be noble to pursue if it were att
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