On the annual International Volunteers Day, the world _____ the work of millions of people who give their time to help others
A.abolishes
B.acpanies
C.acknowledges
D.appeals
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C解析词义辨析.
A.废除;废止 B陪同;陪伴
C.承认;答谢;报偿
D.恳求.根据题意,在每年的国际志愿者日,世界各国都感谢亿万用自己时间去帮助别人的人所做的工作.选C