—Come on Kitty.—Oh good heavens! Both my legs are nearly to give out. I for hours like a

问题补充：

—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

答案：

(答案→)A. have been walking

B. had walked

C. was walking

D. walked

解析：本题考查动词时态。根据句中的my legs are nearly to give out可知本题应该使用现在完成进行时，表示答话人一直走了几个小时的路，因此腿上没有一点儿力气了。