only位于句首有三种状况会引起句子倒装1.only+副词 例句：Only then did I realize the importance of study.2.only +介词短语本题就是这种状况3.Only +状语从句（主句倒装,从句不倒装）例句：Only When I graduated from school,did I realize the importance of study.但要注意：only +名词或代词作主语,句子不倒装例句：Only he knows the answer to the question.only if 是只要的意思,句子不需要倒装,因此本题中的B不正确only if 和 if only 的区别：only...
only位于句首有三种状况会引起句子倒装1.only+副词 例句：Only then did I realize the importance of study.2.only +介词短语本题就是这种状况3.Only +状语从句（主句倒装,从句不倒装）例句：Only When I graduated from school,did I realiz...
only位于句首有三种状况会引起句子倒装1.only+副词 e.g.Only then did I realize the importance of study.2.only +介词短语本题就是这种状况3.Only +状语从句（主句倒装，从句不倒装）e.g.Only When I graduated fro.....
