题目内容
When deeply lost in thought, _______ he often was, he would forget all about eating or sleeping.
| A．that | B．where | C．which | D．when |
C
解析试题分析:考查定语从句。由结构判断此处是定语从句，从句缺少表语，用关系代词，故排除B、D选项， 而that不引导非限制性定语从句，所以答案选C。句意：当他陷入沉思中时，他总会忘记吃饭、睡觉，这种情况时常发生。
考点：考查定语从句。
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