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【单选题】
若干个正方形和等腰直角三角形拼接成如图所示的图形，若最大的正方形的边长是7cm，则正方形A、B、C、D的面积和是（ ）A.
14cm 2
B.
42cm 2
C.
49cm 2
D.
64cm 2
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