who 正确。它引导宾语从句，修饰代词those，同时也是定语从句的主语。
I'd like to give my thanks to those with whose help my son will be able to survive his terrible disease,答案是C
my son will be able to survive his terrible disease with their help,这里把"with their help"这部分提前做了"those"的定语。所以答案应该是with whose
答案应该是who
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