The lessons ________ were not easily forgotten.
The lessons ________ were not easily forgotten.
A.which he taught
B.which was taught
C.that he were taught
D.that he has taught
答案及解析： A
The lessons ________ were not easily forgotten.
A.which he taught
B.which was taught
C.that he were taught
D.that he has taught
答案及解析： A