【题目】The quality of the goods in this firm is _______ to the customers, as there has been no complaint since it was founded.
A. guaranteed B. pretended C. demanded D. extended
在线课程【答案】A
【解析】
试题分析：该公司的产品质量得到保证，因为没有投诉
A考查被动语态，A. guaranteed 保证，B. pretended 假装，C. demanded要求，D.extended延伸。本句意为该公司的产品质量得到保证，因为没有投诉。所以答案选A。