Sentence:  No matter how determined or wealthy boating lovers of the Southwest had <WSD>been</WSD> , for example , they could never have created anything approaching the fifty square-mile Lake Texoma , located between Texas and Oklahoma , which resulted when the Corp of Army Engineers dammed the Red River . 
Meaning of the word marked with <WSD> tags:  have the quality of being; (copula, used with an adjective or a predicate noun)