请选择ABCD3O'?)H0d5I-Q7c7s*y,K1Y _____are____for cutting things./X*O0k0A1Q;V*?0X7E2J.@7{
A. Knife/used/X*O0k0A1Q;V*?0X7E2J.@7{
B. Knives/used/X*O0k0A1Q;V*?0X7E2J.@7{
C. Knife/using/X*O0k0A1Q;V*?0X7E2J.@7{
D. Knives/using/X*O0k0A1Q;V*?0X7E2J.@7{