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。
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