答题库 【2020最新整理国开(电大)人文英语1-3896网上形考机考题库】The firefighters are going to ______________ the cause of the fire.
【2020最新整理国开(电大)人文英语1-3896网上形考机考题库】The firefighters are going to ______________ the cause of the fire.
选择一项：
A. look into
B. look up
C. look down
