As far as I am concerned, Jim is a very boy—if he promises to help us, he’ll do it. A. in

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A. independent
B. confident
(答案→)C. reliable
D. stubborn
解析：A. independent独立的，B. confident自信的，C. reliable可靠的，D. stubborn固执的，句意：据我所知，吉姆是很可靠的男孩，如果他答应帮助我们，他就会帮助的。根据句意选C。