this dress was last year's style.-I think it still looks per

B
解析：原句应翻译为：
—这条连衣裙是去年的款式的.
—我认为它还是看上去很完美_______它已经过时了.
A选项so that是“以便”的意思.
C选项为“似乎,仿佛”的意思.
D选项译为“从那时起”的意思.
三项套入题目中都不符合句意.而D选项为“虽然,尽管”的意思.正好符合原句的句意.因此正确答案为D.
This dress was last year's style.
-I think it still looks perfect even though it has gone out this year.
这条连衣裙是去年的款式.
—我认为它仍然看上去很完美虽然它已经过时了.