【题目】By serving others, a person focuses on someone other than himself or herself, ________ can be very eye-opening and rewarding.
A. which B. that
C. who D. what
在线课程【答案】A
【解析】考查定语从句。后面一句是非限制性定语从句，从句缺少的是主语，先行词是前面整句话的内容，所以用which引导。句意：通过为别人服务，一个人就会关注某人而不是他/她自己，这样也许就能使眼界非常开阔并获得回报。