Explanation:

First, let's break down the sentence:

"__________ (wear) your hair long when you were at school?"

To complete the sentence, we need to fill in the blank with the appropriate verb form.

Simple Past Tense:

The sentence is asking about a past action, specifically during the time when the person was at school. Therefore, we need to use the simple past tense.

Subject - "you":

The sentence is referring to the person being asked, so the subject is "you."

Verb - "wear":

The sentence is asking about the person's hairstyle at school, so the verb "wear" is appropriate as it refers to how the person styled their hair.

Question Form:

The sentence is asking a question, so we need to use the question form of the simple past tense.

Question Word "Did":

To form a question in the simple past tense, we use the auxiliary verb "did" followed by the base form of the main verb. In this case, the question word "Did" is used before the subject "you" to form the question.

Final Answer:

Putting it all together, the correct answer is "Did you wear" because it is the correct question form of the verb "wear" in the simple past tense.

Overall, the answer "Did you wear" is appropriate because it correctly forms a question in the simple past tense, asking about the person's hairstyle during their time at school.