When I was a child, I _ anyone 40 was old15/15When I was a child, I _____ anyone 40 was old.used to thinkwas used to thinkingused to thinkingwas used to thinkGiải thíchĐáp án: A Dịch nghĩa: Khi tôi còn là một đứa trẻ, tôi nghĩ bất cứ ai 40 tuổi đều già