Carol and John hsn't/haven't found them?,该用hasn't还是haven't

Carol and John hsn't/haven't found them?,该用hasn't还是haven't
Carol and John hsn't/haven't found them?,该用hasn't还是haven't

Carol and John hsn't/haven't found them?,该用hasn't还是haven't
haven't
因为主语是两个人 所以谓语用复数