问题
选择题
To improve the quality of our products, we asked for suggestions _____ had used the products.
A．whoever
B．who
C．whichever
D．Which
答案
答案：A
考查名词性从句。本句结构为ask sb for sth 所以后面从句为宾语从句，从句中缺少had used the products的主语，即使用这个产品的人。故排除CD，根据句意可知，无论是谁使用了产品我们都会向他们寻求建议。故选A