He is a man of great help, with help you can solve the problem easily.AhisBwhichC.

网友回答

A. his
B. which
C. whom
(答案→)D. whose
解析：考查定语从句。本题定语从句的先行词是a man，定语从句中的名词help前面缺少定语修饰，故使用whose指代先行词在句中做定语修饰名词，在定语从句中只有whose可以指代人或者物的先行词在句中做定语。故D正确。