Nick accounted for his not having come as usual to see his g
Nick accounted for his not having come as usual to see his grandpa. 请教大家这里为什么要用his呢,还有为什么是having不是have或者had呢? 嗯,还是有点糊涂,那再请教下像这句The police accused him of setting fire to the building.用setting的原因也是同样的吗?