After they had intered the house.had 在这做什么讲?

After they had intered the house.had 在这做什么讲? 新概念after they had entered the house.这是一般过去时?为什么有了had还有 enter after they swam,they had a rest on the----b-------- After she had left,they arrived the station. After the party ,they had a nice d_. The fire broke after they had gone home after the discussion,they e____announced to us what had been the fun they had 谁告诉我这句话的意思After they had claimed themselves,the doctor sugge 这句话中的where怎么理解,在这儿是引导了什么从句吗?the house stood where there had They were proud that they had built the house themselves.这里的 They had to sell their house because they needed the money对划