1.They nameed the island _____it discoverer.
A.after B.in C.to

2.Could you please tell us what kind of work _____ you have got experience?
A.at that B.in which C.which

3.A car hit her when she was walking ___the road.
A.through B.across

答案我有~ 我需要的是为什么选这个??? 而不选别的

1.选A They named the island (after) its discoverer.
他们按发现者（的名字）来命名这个岛屿。

name sth after 按...命名sth --固定搭配
Name in/to不是固定短语，且含义不对。

2.选B Could you please tell us what kind of work in which you have got experience?
你能告诉我们你在什么工作中获得过经验？（有哪些方面的工作经验）
A.at that ： 定语从句的关系代词是that时，前面不能有介词。
B.in which：which关系代词代替work，相当于get experience in which(work)，要用介词in。
C.which: 缺少介词，错误。

3 选B。 A car hit her when she was walking across the road. 当她横穿马路时，被一辆车撞到了。
across 介词，横过，到对面；强调横跨马路，街道，河流，海峡，山川等外部事物的两边，是十字交叉的横穿。
We swam across the river. 我们游到河对岸。
run across the street 横穿马路
sail across the Pacific 横渡太平洋

而through：强调通过某个建筑物内部，通过关口，入口，内部或者沿着某个线路的意思。不能用来表达横穿的意思。
The thief got in through the window.
小偷是通过这扇窗户进来的。
We walked through the market to the truck park.
我们穿过市场到了卡车停车场。