一道英语选择题(尽量说出原因,谢谢各位了~!)

问题描述:

一道英语选择题(尽量说出原因,谢谢各位了~!)
If you have swum _____thesea,you know that it is salty.
A.in B.at C.down D.over(我觉得应该是D)

应该是A
是在海水里的,over仅仅是接触,不会陷在里面