979.To improve the quality of our products,we asked for suggestions ____ had used the products.
A.whoever
B.who
C.whichever
D.which
980.She is very dear to us.We've been prepared to do _____ it takes to save her life.
A.whichever
B.however
C.whatever
D.whoever
979.答案是A;根据句意，此处从句had used the products之前缺少主语，故选whoever。
980.答案是C;考查名词性从句的引导词。在句型It takes…to do sth.中take后面少宾语。
