They looked disappointed because they didn’t the task on time.
A. clarify
B. obtain
C. acplish
D. make
网友回答
A. clarify
B. obtain
(答案→)C. acplish
D. make
解析：本题考查动词辨析。句意为：因为他们没有达到所期望的目的，他们看起来很失望。clarify“澄清，讲清楚”；make“制作”；obtain“获得，得到”；而acplish“完成，达到预期之效果”正合题意，因此选C。