选出下面使等式成立的一组。请选择BA3`)}/X5M)E(l(\5f;F:h(x*z+?'a3b:T/e0[2e
45-20-8=33:h(x*z+?'a3b:T/e0[2e
A45-(20-8)=33:h(x*z+?'a3b:T/e0[2e
B(45-20)-8=33:h(x*z+?'a3b:T/e0[2e