题干
We're very grateful to the teachers _______ taught us in our primary school.
A：which
B：what
C：who
D：whom
答案(点此获取答案解析）
C
We're very grateful to the teachers _______ taught us in our primary school.
A：which
B：what
C：who
D：whom
＋
＋
＝
，则( )