they ___on walking until they found a lack.为什么用kept而不是continued

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they___onwalkinguntiltheyfoundalack.为什么用kept而不是continuedthey___onwalkinguntiltheyfoundalack.为什么用kept

they ___on walking until they found a lack.为什么用kept而不是continued
they ___on walking until they found a lack.为什么用kept而不是continued

they ___on walking until they found a lack.为什么用kept而不是continued
此处有ON ,keep on ===continue