When deeply absorbed in work, ________ h...

When deeply absorbed in work, ________ he often was, he would forget all about eating or sleeping.

A．that

B．which

C．where

D．when

B 【解析】考察定语从句。Which引导非限制性定语从句，指代前面一句话的内容作为was的表语。故B正确。

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