By the following semester, it is likely that the old professor______on the campus of Califor nia University for two decades.

A．will have to be teaching

B．will have been taught

C．will have been teaching

D．will be teaching

运用掌握的法学和社会知识阐释你的观点和理由；　　2、说理充分，逻辑严谨，语言流畅，表达准确；　　3、字数不少于500字。