Chọn đáp án đúng nhất và giải thích:
1.An has a lot of books,...... she was never read
A.most of that.  B.most of these.  C.most of which D.which most of them
2.Pumpkin seeds,.....protein and iron,are a popular snack.
A that. B.provide.  C.which.  D.which provide
3.Mr.Jones,.......I was working ,was generous about overtime payments.
A.he.  B.for whom. C.for him. D.whom