问题描述：
主语单数 表语复数 系动词用什么
FOR INSTANCE:The first sight of a baby who is born to this world just now (is/are) his parents.
ps:系动词单复数取决于主语还是表语
FOR INSTANCE:The first sight of a baby who is born to this world just now (is/are) his parents.
ps:系动词单复数取决于主语还是表语
问题解答：
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