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如图，将边长为4的正方形ABCD的一边BC与直角边分别是2和4的Rt△GEF的 一边GF重合．正方形ABCD以每秒1个单位长度的速度沿GE向右匀速运动，当点A和点E重合时正方形停止运 动．设正方形的运动时间为t秒，正方形ABCD与Rt△GEF重叠部分面积为s，则s关于t的函数图象为
A.
B.
C.
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