Of all the drinks,tea is _____ in the world. It has a history of about 5,000 years.
本题考査最高级的用法。由语境可知，在所有的饮品中，茶是世界上最古老的饮品，故要用最高级。
— Have you seen the movieBaby Plan?
— Of course. I think it's _____ movie I have ever seen.
结合本题语境可知，我觉得《宝贝计划》是我曾经看过的“最好笑的”电影，此处要用最高级，故答案为选项D。