请选择CBA1V-t1p;J/[(H I often ______ to school.-J:J'h;n(z8{2J/A0R3r7T/V/M0[
A. walk-J:J'h;n(z8{2J/A0R3r7T/V/M0[
B. walking-J:J'h;n(z8{2J/A0R3r7T/V/M0[
C. walked-J:J'h;n(z8{2J/A0R3r7T/V/M0[