一道sat 语法in addition to having a theoretical understanding of disease ,medical students must experience in treating patients if he or she is to learn to diagnose illness accurately.为什么he or she is 是错的?求翻译

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一道sat 语法in addition to having a theoretical understanding of disease ,medical students must experience in treating patients if he or she is to learn to diagnose illness accurately.为什么he or she is 是错的?求翻译
一道sat 语法
in addition to having a theoretical understanding of disease ,medical students must experience in treating patients if he or she is to learn to diagnose illness accurately.为什么he or she is 是错的?求翻译

一道sat 语法in addition to having a theoretical understanding of disease ,medical students must experience in treating patients if he or she is to learn to diagnose illness accurately.为什么he or she is 是错的?求翻译
if he or she is 要改成if they are.
这里是指medical students 要变成复数的.“如果他们要,就必须...”