单项选择题
A.3 B.16 C.255 D.256
A.=SUM(C1:Cn) B.=SUM(A1:Bn) C.=SUM(An:Bn) D.=SUM(A1:Cn)
A.=SUM(F1:F2,F4:F6,C3:E3) B.=SUM(G1:G2,G4:G6,D3:F3) C.=SUM(G3:G4,G6:G8,D5:F5) D.=SUM(G2:G3,G5:G7,D4:F4)