knives are used ______ things .A.cut B.cutting .C.to cut D.in cutting

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knives are used ______ things .A.cut B.cutting .C.to cut D.in cutting
knives are used ______ things .
A.cut B.cutting .C.to cut D.in cutting

knives are used ______ things .A.cut B.cutting .C.to cut D.in cutting
c be used to do sth,被用来做什么 固定结构

c