He kept thinking of the question whether it was for his father to change the habit of a l

问题补充：

He kept thinking of the question whether it was for his father to change the habit of a life time in such a short time.

A. possibly

B. probable

C. likely

D. possible

答案：

A. possibly

B. probable

C. likely

(答案→)D. possible

解析：考查词义辨析及用法，横线前是was，所以应用形容词，可排除A，probable 很可能，likely 可能的，常用短语：be likely to do ，possible 可能的，常用句型： it is possible for sb to do ，句意：他一直在思考这个问题对他的父亲来说在如此短的时间之内是否可能改变生活时间的习惯。所以选D。