为什么要加did?Only when he got into trouble____not having taken Mary’s advice.A、he regrettedB、did he regretC、regreted he D、had he regretted 选B,为什么选,涉及那些知识点?我选了A,为什么会错?是那些知识点不清楚

only this morning did i I hear the sad news,为什么要加DID Only when I saw Tina sit in the dark alone did I realize she was unhappy.did为什么要放在 I 的前面? 为什么要加did?Only when he got into trouble____not having taken Mary’s advice.A、he regrettedB、did he regretC、regreted he D、had he regretted 选B,为什么选,涉及那些知识点?我选了A,为什么会错?是那些知识点不清楚 when did the story take place?为什么要用did only when-------to explain----the reason for this.started.did she realize为什么啊 Only when they put their heads together did they make such a brilliant plan为什么用did What did she say?为什么要加did only ____from his heart trouble ___back to his teaching Awhen he recovered;he cameB when did he recover ;did he come Cwhen did he recover;he came D when he recovered ;did he come 为什么选D Only when you told me about it did i realize what a silly thing I had done..为什么用did i realize? they did not pay any attention为什么要加did.不懂did得用法? Only when class began_____that he had left his book at home.A.will he realizedB.he did realizeC.did he realizeD.should he realize为什么要用did he realize如果不是倒装那语序应该是he did realize,感觉好奇怪 only倒装句Only him did I see yesterday.Only a daoctor they saw working,when they arrived the hospital.only后面都接的是宾语,为什么第一个是倒装而第二个不倒装?求详解 在倒装句中,比如Only when he reached the tea-house (did he realize)it was the same place he'd been 接上in last year.为什么要选有助动词的？realized he为什么错了 一个小小的语法疑惑When did you begin feeling ill?这个feel为什么要加ing啊!直接用feel原形不可以吗? When did it start?为什么did用过去式? Did.you.have.fun.caming中为什么要加have Only when I left home ,did i realized how important it was to stay at home?此中为什么不用HAD I REALIZED? Only when the police___her with evidence did she admit that she had stolen the money.A:confrontedB:connectedC:confinedD:confessed选哪个?为什么?