市场分割理论具有明显的缺陷，持这种观点的投资者越来越少。()
参考答案：对
— Come on, Kitty.
— Oh, good heavens! Both my legs are nearly to give out. I ____ for hours like a dog. [ ]
A. have been walking
B. had walked
C. was walking
D. walked
国际战略联盟
