He is not selfish at all; instead he is always to help others in trouble.A. possibleB. li

问题补充：

He is not selfish at all; instead he is always to help others in trouble.

A. possible

B. likely

C. probable

D. willing

答案：

A. possible

B. likely

C. probable

(答案→)D. willing

解析：句意：他根本就不自私，相反，他总是愿意帮助有困难的人。Be willing to do是固定句型，意思是愿意做某事，可知选D。