单选题Only when he put his

问题补充：

单选题Onlywhenheputhisfootintotheriver________thatthewaterwastoocoldtoswimin.A.he realizedB.did he realizeC.had he realizedD.he had realized

答案：

B解析试题分析：考查倒装，only＋状语(状语从句)放句首时，主句要用倒装语序所以选B考点：考查倒装点评：不完全倒装，是把助动词提前；而完全倒装是把动词放在主语的前面。注意句子when he put his foot into the rive…是 when引导的时间状语从句。句子that the water was too cold to swim in.是个宾语从句。