Of the three statements he has suggested the heating problem, I think the last one is the

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A. solving
(答案→)B. to solve
C. to solving
D. solve
解析：考查非谓语动词。句中he has suggested作定语，修饰名词statements。故to solve the heating problem为不定式作定语修饰名词statements。句意：他建议的发热问题的三种陈述中，我认为最后一个最好。故B正确。