His grandfather … from his job a year ago.

• Retired
• Was retiring
• Has retired

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To determine the correct verb form to complete the sentence "His grandfather … from his job a year ago," we need to consider the context and the time frame provided by the phrase "a year ago." This phrase indicates a specific point in the past, which helps us choose the appropriate tense.

Let's analyze the options:

1. Retired: This is the simple past tense of the verb "retire." The simple past tense is used to describe actions that were completed at a specific time in the past. Since "a year ago" clearly refers to a specific past time, "retired" is the correct choice.
2. Was retiring: This is the past continuous tense. It is used to describe actions that were ongoing in the past, often when another action occurred. However, "a year ago" suggests a completed action rather than an ongoing one, so this option is not suitable.
3. Has retired: This is the present perfect tense, which is used to describe actions that occurred at an unspecified time in the past and have relevance to the present. Since "a year ago" specifies the time of the action, the present perfect tense is not appropriate here.

Therefore, the correct sentence is: "His grandfather retired from his job a year ago."