[Ask ] MCQ

[Luckysmile (日月頭上一根草)]

Hi there, I had a MCQ that made me confused. I need answer and why.
here's the question

"Johnny could not____his neighbor. He was with me last night."
(A)kill (B)killed (C)have killed (D)had killed


I know the answer now, but I did wrong at first. i just don't know why

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→ Luckysmile: I found the answer
→ Luckysmile: could not have+Vpp = impossible
推 phiz: Thanks for sharing
推 ebeyaya: Thank you for sharing.