To improve the quality of our products we ask has used them for suggestions.A. anyoneB.

问题补充：

To improve the quality of our products, we ask has used them for suggestions.

A. anyone

B. who

C. no matter who

D. whoever

答案：

A. anyone

B. who

C. no matter who

(答案→)D. whoever

解析：考查名词性从句。句中whoever引导宾语从句，在从句中作主语，故选D。