1,2,1,6,9,10,()
A.13
B.12
C.19
D.17
1,2,1,6,9,10,() A.13;B.12;C.19;D.17;
:2,2,0,7,9,9,() A.13B.12C.18D.17
2,2,0,7,9,9,() A.13B.12C.18D.17
1,3,O,6,10,9,()。A. 13B.14C.15 D.17