摘要： By serving others.a person focuses on someone other than himself or herself. can be very eye-opening and rewarding. A.who B.which C.what D.that 答案 B 解析 空白处所在句为非限制性定语从句.C.D两项可排除.关系词在句中作主语.且指代上文的事情.所 以A项可排除.

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