Charlie Chaplin for life was hard went to the USA to earn his life when he was young.A.

问题补充：

Charlie Chaplin, for life was hard, went to the USA to earn his life when he was young.

A. whose

B. who

C. whom

D. his

答案：

A. whose

B. who

(答案→)C. whom

D. his

解析：通过分析句子结构，可知这个句子中包含一个由介词 + 关系代词引导的定语从句,直接位于介词之后的关系代词只能是which，whom或whose，构成介词+which（指物）；介词+whom/whose（指人）两种结构,故排除B和D，这里关系代词作介词for的宾语，故选C。