Final answer:
The sentence needs context from a letter of recommendation, highlighting the student's suitability for the job, the relationship with their advisor, and a persuasive argument for their hiring, along with an attachment of their current résumé.
Step-by-step explanation:
To address the question of what the sentence needs, we must understand the components of a formal recommendation letter, particularly when seeking employment. The sentence in question, 'Before the student could be hired by the company, the student's adviser had to provide a letter of recommendation,' indicates that a prerequisite for a student's employment is obtaining a recommendation from an adviser. In the context of writing a job application or a recommendation letter, it is vital to include relevant details that can persuade the company of your suitability for the job.
An effective introduction in a letter of recommendation would explain the connection between the recommendee and the recommender and highlight the recommendee's relevant skills and experiences. When writing a job application letter, the applicant should begin by expressing their interest in the role and how they learned of the opportunity. The letter should then articulate the applicant's strengths and why they would be an asset to the company. Additionally, it's crucial to attach a current résumé to provide the employer with more detailed information about the applicant's qualifications and background.