A.23/50
B.17/40
C.11/30
D.7/20
[单选题]1/4,3/10,( ),2/5。A.23/50B.17/40C.11/30D.7/20
[单选题]1/4,3/10,( ),2/5。A.23/50B.17/40C.11/30D.7/20
[单选题]1/4,3/10,( ),2/5。A.23/50B.17/40C.11/30D.7/20
[单选题]1/4,3/10,( ),2/5。A.23/50B.17/40C.11/30D.7/20
[单选题]1/4,3/10,( ),2/5。A.23/50B.17/40C.11/30D.7/20
[单选题]1/4,3/10,( ),2/5。A.23/50B.17/40C.11/30D.7/20
[单选题]1/4,3/10,( ),2/5。A.23/50B.17/40C.11/30D.7/20
[单选题]1/4,3/10,( ),2/5。A.23/50B.17/40C.11/30D.7/20
[单选题]1/4,3/10,( ),2/5。A.23/50B.17/40C.11/30D.7/20
[单选题]1/4,3/10,( ),2/5。A.23/50B.17/40C.11/30D.7/20