For the moment,Frank got a funny look on his face,and the tears began to well up in his eyes."It wasn't long after that when my Dad went to sea and never came back."
句中的when引导时间状语从句，和前面的it是什么关系？
It wasn't long after that when my Dad went tosea and never came back. 这是强调句型，强调时间状语not long after not。不强调的句子为：Not long after that, my Dad went to sea andnever came back. 一般强调句型的从句由that 引导，但由于被强调的时间状语以介词that结尾，为了防止二个that 连续出现，所以用when替换了that。