Elbert Einstein, for life had once been very hard, was successful later in science .
A. whom
B. whose
C. which
D. his
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(答案→)A. whom
B. whose
C. which
D. his
解析： 容易B。原因是受思维定势的影响认为whose life是一个整体。定语从句的主语应该是life， 本句可以改写为: life had once been very hard for him, 所以在定语从句中介词for还缺少了一个宾语。所以A。