Question

When deeply absorbed in work，________he often was，he would forget all about eating or sleeping.                                                        (2012·北京，26)

A．that	B．which
C．where	D．when

Answer 1

B
解析　句意为：当他全身心地投入工作中时，他就会废寝忘食，而他经常这样(全身心地投入工作)。由引导词前面的逗号可知，这是一个非限制性定语从句，所以首先排除that。由定语从句的was可知，定语从句缺少表语，所以排除在定语从句中作状语的where和when。故选B项。