I can't help you--the house this afternoom.A,sweeping'B,swee

选B
can not halp doing是情不自禁的意思,所以A不对
C选项因为时间已经给出是这个下午,属于将来时,所以不对
D选项是with是介词 就算后面跟动词也是动名词 应该是doing