I haven’t seen Li Lei these days. He was said _____ to the hospital to receive treatment.

A．to take

B．to have taken

C．to be taken

D．to have been taken

小红在观看国庆的游行队伍时，观察到远处走来的锣鼓队中敲锣打鼓的人的敲击动作和鼓声不大合拍，请你分析产生这种现象的原因。