Choose the letter A, B, C or D to complete the sentences with given words

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4. *Choose the letter A, B, C or D to complete the sentences with given words
What/ be/ you/ and/ your friend/ do/ at 11 a.m. yesterday?
(25 Điểm)
What was you and your friend doing at 11 a.m. yesterday?
What were you and your friend do at 11 a.m. yesterday?
What was you and your friend do at 11 a.m. yesterday?
What were you and your friend doing at 11 a.m. yesterday?