英语选择

My grandmother couldn’t read so she listened closely___I read the letter.
A. till
B. where
C. after
D. while
More and more people are turning away from__Western medicine to other methods of treatment.
A. statistical
B. pushy
C. conventional
D. interactive
It is said that the math teacher seems _______ towards bright students.
A. partial
B. beneficial
C. preferable
D. liable
My mother often said that she would never forget the four years___she spent in the country with my grandparents.
A. in which
B. on which
C. when
D. that