请问选A还是选D?选A,D有什么区别?

A
that作为定语从句的引导词,同时为visited的宾语.
你把句子分
This is the museum.You visited the museum last month
很显然the museum是visited的宾语.
where作状语.如
This is the museum where I worked ten years ago.
分解后：
This is the museum.I worked in the museum ten years ago.
很明显,in the museum为worked的地点状语.