宫颈癌的病因主要为（）

A.早婚、早育、多产

B.包皮垢的影响

C.疱疹病毒Ⅱ型及人类 * * 瘤病毒感染

D.慢性宫颈炎及宫颈裂伤

E.以上多种因素的协同作用

They had a wonderful time ______. [ ]

A. to chat on the Internet

B. chatting on the Internet

C. to chat in the Internet

D. chatting in the Internet