单选题 Elbert Einstein, for ______ life had once been very hard, was successful later in science.

【正确答案】 A

【答案解析】[解析] 容易选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。所以选A。