but this does not matter,for,as he has often remarked,one is never to old to learn

问题描述:

but this does not matter,for,as he has often remarked,one is never to old to learn
然后为什么前后加标点

as he has often remarked 看出插入成分,前后用逗号
for因为
全句意思:这并不重要,因为,正如他经常说的,活到老,学到老!