When deeply absorbed in work,________he often was,he would forget all about eating and sleeping为什么不能用when

问题描述:

When deeply absorbed in work,________he often was,he would forget all about eating and sleeping
为什么不能用when

句意应是“像他经常那样”,应该是个as引导的特殊定语从句,用when不合适

用which或as都可以.这是个非限定定语从句,连接词代替的是When deeply absorbed in work整句,所以when是不行的.