答案：D

considered 考虑; admit 承认; absorb 吸收。acknowledge 1) (="agree" or admit the truth of; confess) 承认, 供认; A. He acknowledged his mistake. (他承认了他的错误。) B. 接动名词 He acknowledged having been beaten. (他承认被打败了。) 2) (express thanks for) 致谢; A. Mary acknowledged the gift with a pleasant letter. (玛丽致函感谢馈赠的礼物。