问题描述：
关于谓语动词单复数,
About 50% of the world's labour force is female.为什么动词是IS?
Half of the top ten richest people in the world are women.为什么是ARE?
单复数是跟前面名词单复数有关吗?
About 50% of the world's labour force is female.为什么动词是IS?
Half of the top ten richest people in the world are women.为什么是ARE?
单复数是跟前面名词单复数有关吗?
问题解答：
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