B=[-3，2a- 1]；
- 1 & lt； a & lt 1,
C=[0， 1]，2a- 1 & lt； 1, so c does not belong to B.
a & gt= 1,
C = [0, a 2], if C belongs to B, then a 2.
A must equal 1.
To sum up, the condition is satisfied when a= 1