Charlie Chaplin is considered ________ a great contribution to the film industry.

A．to make

B．making

C．to have made

D．having made

下列哪种物质不是抗体()

A．胎盘球蛋白

B．抗毒素血清

C．淋巴细胞抗血清

D．植物血凝素

E．白喉抗毒素