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【单选题】
关于功的概念，下列说法正确的是（　　）
A.
只要有力作用在物体上，对物体做功
B.
物体只要移动了距离，就有力对它做了功
C.
只要有力作用在物体上，物体在力的方向上又移动了距离，则这个对物体做了功
D.
有力作用在物体上，物体又移动了距离，这个一定对物体做了功
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