It is a truth universally that a single and rich man must be in want of a wife.
A. achnowledging
B. achnowledged
C. be achnowledged
D. to achnowledge
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A. achnowledging
(答案→)B. achnowledged
C. be achnowledged
D. to achnowledge
解析：考察分词做定语。本句中的it是形式主语，真正的主语是后面的that引导的主语从句that a single and rich man must be in want of a wife.名词truth与动词achnowledge之间构成被动关系，故使用过去分词表示被动。C项中的be是多余的。句意：这是一个被广泛承认的事实，一个富有的单身男人一定需要一个妻子。故B正确。