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【单选题】
已知正方体ABCD-A 1 B 1 C 1 D 1 中， A 1 E = 1 4 A 1 C 1 ，若 AE =x A A 1 +y( AB + AD ) ，则（ ）A.
x= 1 2 ，y= 1 2
B.
x= 1 2 ，y=1
C.
x=1，y= 1 3
D.
x=1，y= 1 4
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