When deeply absorbed in study,_ he often was,he would forget all about eating. A.when. B.where. C.which. D.what

问题描述:

When deeply absorbed in study,_ he often was,he would forget all about eating. A.when. B.where. C.which. D.what

填 C.which.
When deeply absorbed in study,which he often was,he would forget all about eating.