问题补充：
To improne the pmlity of our products we uaked for nuggratior a had used the producu.
A. whacver
B. who
C. whichever
D. which
答案：
(答案→)A. whacver
B. who
C. whichever
D. which
解析：考查关系代词。这儿 used the products。是个宾语从句，从句中缺少主语，并且指人，所以用whoever.选A。
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