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【单选题】
s="A001,,100,90,88\nA002,,78,81,90\nA003,,89,91,89"a=s.split("\n")b=[]for i in a: b.append(i.split(","))print(b[0][3]+b[1][3]+b[2][3])运行上面程序，显示__________。A.
90 81 91
B.
908191
C.
90
D.
262
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