All the candidates present at the conference have contributed to the development of our country, so they are each recognized specialists in their fields.
A. respective
B. respected
C. respecting
D. respectful
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(答案→)A. respective
B. respected
C. respecting
D. respectful
解析：会议上所有出席的候选人都对国家的发展有贡献，所以他们每一个人都是公认的各个领域的专家。Respective 各自的 respected 尊敬的 respecting 尊重 respectful 有礼貌的，根据题意，故选A。