When deeply absorbed in work, ______ he often was，he would forget all about eating or sleeping.
When deeply absorbed in work, ______ he often was，he would forget all about eating or sleeping.
A、that
B、which
C、where
D、when
【正确答案】：B
【题目解析】：非限制性定语从句；which指代前面整个句 When deeply absorbed in work。指代整个句子时要使用which指代
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