  The ground state of a rotating Bose-Einstein condensate with attractive
interaction in a quasi-one-dimensional torus is studied in terms of the ratio
$\gamma$ of the mean-field interaction energy per particle to the
single-particle energy-level spacing. The plateaus of quantized circulation are
found to appear if and only if $\gamma<1$ with the lengths of the plateaus
reduced due to hybridization of the condensate over different angular-momentum
states.
