问题补充：
Jack is one of those men who I am sure always do best even in the most difficult
situations.
A. his
B. your
C. their
D. one’s
答案：
A. his
B. your
(答案→)C. their
D. one’s
解析：根据句意排除B，考查“do one’s best”的用法，Jack只是这么众多人中敢于面对困难的人之一，分析清楚句子前后关系可以判断C为正确答案。
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