I WALKED ALONG MAIN STREET

7. - File thứ 15: De va dap an Anh 12
File thứ 15: De va dap an Anh 12
7. I walked along Main Street. I realized a man behind me. (when)A. When I walked along Main Street, I was realizing a man behind me. B. When I was walking along Main Street, I had realized a man behind me. C. When I was walking along Main Street, I realized a man behind me. D. When I was walking along Main Street, I was realizing a man behind me.