✨ คำตอบที่ดีที่สุด ✨
Both work.
Employees who believe they are eligible should let their managers know that they would like to apply for a pay raise.
那些認為自己符合資格的員工 應該讓他們的主管知道說 他們想要申請加薪
Employees who believe they are eligible should let their managers know if they would like to apply for a pay raise.
那些認為自己符合資格的員工 應該讓他們的主管知道說 他們是否想要申請加薪
我覺得這題你不用太糾結,特別注意if語意上也是正確的就好。
謝謝您的解答!