句子一定打错了.楼主想说的应该是It is after Mary's refusal that he made up his mind never to think of marrying again.这是一个强调句.结构是It is+（需要强调的部分）+that+从句.意思是：自从被Mary拒绝之后,他决心终身不再考虑婚嫁之事.