the man had expected to see all his realatives when he was i

首先看一下两者的区别：
no one
1.表示没有人,
2.作主语时,谓语动词用单数 No one is over there.
3. 回答who 问句：Who is in the room? No one.
none
1.全部否定,表示没有东西/人
2.作主语时,如果指人,谓语用复数；如果指物用单数.
None of the boys like singing.
None of the books belongs to him.
从句子意思可知,but后面是表否定的,应用none,指代前面提到的all his realatives ,是复数形式

no one 谓语动词用单数,none谓语动词用单或复数.
从all his relatives可以看出来应该是用复数。所以排除no one!

none 特指，在这道题里就是个特指他的亲戚中没有人来看他 no one 泛指没,句中省略了his relatives ，而且none也和句子前面的all对应