问题描述：
单复数的语法求助.
（澳洲海岛管理员）招聘主办方昨日颁布发表,“世界最好的工作”50人初选名单出炉,来自22个国家的50名候选人入围--最终胜出者将安享高薪待遇,在澳大利亚的一个回归岛屿工作6个月.
A shortlist of 50candidates from 22countries has been selected for"the best job in the world"-being well paid to spend six months on a tropical Australian island,organizers said yesterday.
这句句子from 22countries has been selected 为什么是HAS 主语不是SHORTLIST啊?
（澳洲海岛管理员）招聘主办方昨日颁布发表,“世界最好的工作”50人初选名单出炉,来自22个国家的50名候选人入围--最终胜出者将安享高薪待遇,在澳大利亚的一个回归岛屿工作6个月.
A shortlist of 50candidates from 22countries has been selected for"the best job in the world"-being well paid to spend six months on a tropical Australian island,organizers said yesterday.
这句句子from 22countries has been selected 为什么是HAS 主语不是SHORTLIST啊?
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