there were still many people in the museum,(though) it was c

though,so的使用在意思上有所区别：
There were still many people in the museum,(though) it was crowded.
虽然博物馆已水泄不通,但仍有很多人.
There were still many people in the museum,(so) it was crowded.
博物馆里仍有许多人,所以它水泄不通.
根据上下文的意思选择了.
而且,根据语感,though更上口,毕竟没有那么强烈的因果关系.
希望可以帮到你.