________ made his family disappointed.[ ]

A. He not being chosen        

B. His not having been chosen

C. Him not being chosen      

D. He was not chosen

塑料通信管道的埋设深度是指管顶至路面，在人行道的深度应不低于（）米，在车行道应不低于0.8米，低于此标准应该用混凝土包封或钢管保护。