Was it from the teacher　_______you learned about this？

A. when  B. where  C. that  D. which

Was it from the teacher　　　　you learned about this？

A. when          B. where            C. that               D. which

Was it from the teacher　　　　you learned about this？

A. when      B. where      C. that      D. which

 Was it from the teacher　　　　you learned about this？

A.  when         B. where              C. that D. which

 Was it from the teacher　　　　you learned about this？

A. when          B. where            C. that               D. which