最近在读文法 关系词的部分
先行词如果被最高级或者序数词（the first, the second)修饰，就一定要用关系代名词
that
例句题目
He was the first person, He solved all the puzzles.
答案
He was the first person who solved all the puzzles.
看起来答案跟上面的说法不符
是答案有问题吗？谢谢