even an end which it would be noble to pursue if it were att
2个回答

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.