A.2/5
B.6/11
C.3/4
D.7/12
[单选题]2/3,1/2,5/9,( ),11/15。A.2/5B.6/11C.3/4D.7/12
[单选题]2/3,1/2,5/9,( ),11/15。A.2/5B.6/11C.3/4D.7/12
[单选题]2/3,1/2,5/9,( ),11/15。A.2/5B.6/11C.3/4D.7/12
[单选题]2/3,1/2,5/9,( ),11/15。A.2/5B.6/11C.3/4D.7/12
[单选题]2/3,1/2,5/9,( ),11/15。A.2/5B.6/11C.3/4D.7/12
[单选题]2/3,1/2,5/9,( ),11/15。A.2/5B.6/11C.3/4D.7/12
[单选题]2/3,1/2,5/9,( ),11/15。A.2/5B.6/11C.3/4D.7/12
[单选题]2/3,1/2,5/9,( ),11/15。A.2/5B.6/11C.3/4D.7/12
[单选题]2/3,1/2,5/9,( ),11/15。A.2/5B.6/11C.3/4D.7/12
[单选题]2/3,1/2,5/9,( ),11/15。A.2/5B.6/11C.3/4D.7/12