请选择ABC:\;k,j'h0|4y2Q)S -Who are your parents talking ____________?4u(x)A+S1x+E,[
-I don't know.4u(x)A+S1x+E,[
A. for4u(x)A+S1x+E,[
B. to4u(x)A+S1x+E,[
C. on4u(x)A+S1x+E,[