According to the latest research, getting enough sleep is to maintaining good health and reducing stress.
A. essential
B. promising
C. special
D. sensible
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(答案→)A. essential
B. promising
C. special
D. sensible
解析：本题考查形容词辨析。句意：根据最新的研究，得到足够的睡眠是对保持身体健康和减少压力都是必不可少的。essential必要的,不可缺的。