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单选题
Two polygons must congruent if ______.
A
they are both regular
B
they have the same number of sides
C
their corresponding sides and angles are equal
D
their corresponding sides are equal
E
they have the same shape
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参考解析
解析：
Two polygons are congruent if their corresponding sides and angles are equal.
Two polygons are congruent if their corresponding sides and angles are equal.
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