Sentence:  But Blanche had been able to maintain a serene and assured composure in the face of her widowed mother 's continued carping , had <WSD>been</WSD> able to resist her urgings to date anyone who offered the slightest possibility of matrimony . 
Meaning of the word marked with <WSD> tags:  have the quality of being; (copula, used with an adjective or a predicate noun)