你买词典了吗?是have you bought a dictionary? 还是did you bought a dictionary?

是did you bought a dictionary?

Have you bought a dictionary?

是have you bought a dictionary?

前者吧，后者的格式很显然是错误的

Have you bought a dictionary?是正确的,但一般不会这么表达,
用“Do you have a dictionary?”更明白直接