Eddie found Hobo m___ the floor when he came in.请求告知原因
问题描述：
Eddie found Hobo m___ the floor when he came in.
请求告知原因
答
没有选项吗？
答
mopping
答
mopping
mop the floor 拖地
加ing是因为前面的found, found somebody doing, 发现某人正在做某事