题目内容：
Elbert Einstein, for ______ life had once been very hard, was successful later in science . A. whom
B. whose
C. which
D. his
参考答案：
选择题：Elbert Einstein, for ______ life had once been ver
- 题目分类： Elbert Einstein, for ___
- 题目类型：选择题
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A. whom
B. whose
C. which
D. his