There is a saying swimming is a good way to keep fit.A. whichB. whatC. thatD. where

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A. which
B. what
C. that
D. where
解析：  考查同位语从句。swimming is a good way to keep fit是saying的具体内容。从句中不缺少任何成分，所以排除A、B、D三项。再依据句意可知答案为C项。