【题目】By serving others,a person focuses on someone other than himself or herself,_______can be very eye-opening and rewarding.
A.whoB.which
C.whatD.that
在线课程【答案】B
【解析】which引导非限制性定语从句,指代整个句子。在非限制性定语从句中,必须用which引导,而不用that引导。who引导定语从句时,其先行词是表示人的名词。what不用于引导定语从句,而用于引导名词性从句。