I was walking along the street when someone across the street waved his hand to me, as if _____ me

something.[ ]

A. telling  

B. told  

C. was telling  

D. to tell

观察与阅读下列材料，回答问题。

世界各地所有的人都在认真地思考并坦率地议论着西方的社会制度也许会失败和不再起作用的可能性。——阿诺德·汤因比