.Having heard the customers’ , they decided to improve their products.
A. plaints
B. sacrifice
C. arrangement
D. suffering
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(答案→)A. plaints
B. sacrifice
C. arrangement
D. suffering
解析：词义辨析。A. 抱怨；诉苦 B. 牺牲；祭品 C. 布置；整理 D. 受难；苦楚。句意：听到顾客的抱怨后，他们觉得提高产品质量。故选A。