Even though it was not illegal for the bank to share its customers' personal and financial information with an outside marketing company in return for a commission on sales, the state's attorney general accused the bank of engaging in deceptive business practices by failing to honor its promise to its customers to keep records private.
by failing to honor its promise to its customers to keep
by its failure of honoring its promise to its customers to keep
in its failing to honor its promise to its customers of keeping
because of its failure in honoring its promise to its customers in keeping
because of its failure to honor its promise to its customers of keeping
change in meaning: the correct meaning is what appears in the original sentence, namely, that the failure to honor promises WAS the deceptive business practice. 没有保持承诺本身就是商业欺诈 choice e, with its use of 'because', implies that the failure to keep promises LED TO (other) deceptive business practices. 没有保持承诺导致了商业欺诈
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