【2020最新整理国开(电大)人文英语1-3896网上形考机考题库】The gunman stood ____________ the theatre and shoot at the audience inside.

【2020最新整理国开(电大)人文英语1-3896网上形考机考题库】The gunman stood ____________ the theatre and shoot at the audience inside.
选择一项：
A. at the front of
B. in front of
C. on front of