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【单选题】
几个共点力作用在同一物体上,使它处于平衡状态。若其中一个力 F 停止作用,则物体将A.
改变运动状态，合力方向与 F 方向相同
B.
改变运动状态，合力方向与 F 方向相反
C.
改变运动状态，合力方向无法确定
D.
运动状态不变
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A.
was wanting
B.
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has been wanting
【单选题】The boy was delighted with his new story book which he ________ for a long time.
A.
was wanting
B.
has wanted
C.
has been wanting
D.
had been wanting
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