Question

He was the only friend I made during the four years ______ I was at university.

a)what b)which c)since d)that 说明一下理由，谢谢

Answer 1

since
这是一个时间状语,翻着"进大学的四年来"
用since
连接
A,what
在句中当主语
B,which
多为定语而且不能修饰人,
D,可以修饰人,但此处缺的不是定语成分
所以选C

Answer 2

你好！
which
语感！首先能排除D,C.
如果对你有帮助，望采纳。