they had completed the project by the end of 1999...翻译成到1999年年底,还是翻译成 到1999年底之前

they had just had enough time to swim out of danger when the boat again completed a circle.解释两个had 越清楚越好 They keeps talking about the party,they had a very nice time,______?A:hadn't they B:didn't they C:had they D:weren't they 【问】The work （has completed)so they decided to have a holiday.为什么不用had completed?只有确保我们的工作完成了,才会做出要度假的决定,应该是过去的过去吧 he had the house painted blue when they moved in,___?did he had they didn't theyhadn't they completed 5.the program,they had to stay there for another two weeks.A.Not completingB.Not completedC.Not having completedD.Having not completed横线在the 前面 they had completed the project by the end of 1999...翻译成到1999年年底,还是翻译成 到1999年底之前 if there had not been a layer of rock beneath the soil they would have completed the job.为什么开头 there后面没有was 省略了吗 By the end of last year the railway___.A.was being completed B.would be completed C.had completed D.had been completed They had to stay at home yesterday,______?A.hadn't they B.had they C.didn't they D.did they They had to get off at the next stop,________?A.hadn't they B.had they C.didn;t they D.did they 选哪一个啊 they had to finish the work before they went home yesterday,didn't they?为什么不能用hadn't they They didn't tell me whether she had got well they had to change the planes ,() they A hadn't B didn't C did ______the programme,they have to stay there for another two weeks.”A.Not completing B.Not completerd C.Not having completed D.Having not completed为什么?为什么不选D?现在完成时的否定形式明明是haven't they had a great time in the World Park,()they?A.didn't B.hadn't C.did D.had they had to walk there,hadn't they?怎么改 he had better stay here,doesn't he?怎么改 高一英语24He had the house painted blue when they moved in ,（ A did he B had they C didn‘t they D hadn’t they