问题补充:
The old man needs a stick more steadily.
A. to walk, to walk
B. walking, walking
C. walking, to walk
D. to walk, walking
答案:
A. to walk, to walk
B. walking, walking
(答案→)C. walking, to walk
D. to walk, walking
解析:本题的含义是那个老人需要一个拐杖才可以走得更稳,walking stick可以表示拐杖的意思,需要某物做某事可用need sth to do,故本题选C。