He became self-satisfied because of his .A. achievementsB. observationC. behaviorD. Intere

问题补充：

He became self-satisfied because of his .

A. achievements

B. observation

C. behavior

D. Interests

答案：

(答案→)A. achievements

B. observation

C. behavior

D. Interests

解析：

试题解析：名词辨析。A成就；B观察；C行为D爱好。句意：因为他取得的成就，他感到自我满足。根据意思选A.