已知 $\log _{a} \frac{1}{4}<0,\left|\log _{b} a\right|=-\log _{b} a$, 则 $a, b$ 满足的关系式是 ( )
 $\because \log _{a} \frac{1}{4}<0, \therefore a>1$,

$\because\left|\log _{b} a\right|=-\log _{b} a, \quad \therefore \log _{b} a<0$, 又 $_{a>1}, \quad \therefore 0<b<1$,

故选B.