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单项选择题

Each of the nine squares marked 1A to 3C in the grid should incorporate all the lines and symbols that are shown in the squares of the same letter and number immediately above and to the left. For example, 2B should incorporate all the lines and symbols that are in 2 and B. One of the squares is incorrect. Which one is it

A.1A.
B. 2C
C.3B
D.3C.
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