有2个网友回答
1.he would forget all about eating and sleeping，为主句。
2.这是整个一句话，主语在主句里。
3.which是指代deeply absorbed in work。非限制性定语从句要么指代前面这个句子，要么指代前面一个名词或名词短语。
4.你改的那句话很别扭，一般不会有这种说法
he would forget all about eating and sleeping 这是主句。。。主谓宾齐全！！！
which指代的是When deeply absorbed in work这件事。。。
在非限定性定语从句中，which 可以代替前面一整个句子。。例如
Steve Jobs is gone,which upsets a lot of Apple fans.
理解了吗？
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