A.90
B.60
C.76
D.89
[单选题]2,12,30,56,( )。A.90B.60C.76D.89
[单选题]2,12,30,56,( )。A.90B.60C.76D.89
[单选题]2,12,30,56,( )。A.90B.60C.76D.89
[单选题]2,12,30,56,( )。A.90B.60C.76D.89
[主观题]2,12,30,()A、50;B、65;C、75;D、56
[主观题]2,12,30,()A.50;B.65;C.75;D.56
[单选题]2,12,30,()A .50B .65C .75D .56
[单选题]0,2,6,12,20,30,( )。A.34B.38C.40D.42
[单选题]0,2,6,12,20,30,( )。A.34B.38C.40D.42
[单选题]0,2,6,12,20,30,( )。A.34B.38C.40D.42