He had worked for us for 10 years是过去完成时吧?这句话和He used to work for us for 10 years有区别吗?两者应该都是过去完成时吧,我在语法书上看到过去完成时是had+过去分词,但是后面这句话里面并没有had

He said ______for the firm for over ten yearsA.has worked B.had worked He had worked for us for 10 years是过去完成时吧?这句话和He used to work for us for 10 years有区别吗?两者应该都是过去完成时吧,我在语法书上看到过去完成时是had+过去分词,但是后面这句话里面并没有had Mark_in China for 10 years and now he teaches Chinese in Britain 请说明理由 回答其他答案忽略A、has worked B、worked C、had worked Mark _________ in China for 10 years and now he teaches Chinese in Britain.A.has worked B.worked C.had worked D.is working He works in China,but he___in Africa for 8 years.A.work B.has worked C.had worked D.has been workingA选项写错了，应该是worked. By the time he graduates,i__in the accounting company for 5 yearsA had worked B will have worked Cwork D have worked选什么为什么 By the time he graduates,i__in the accounting company for 5 yearsA had worked B will have worked Cwork D have worked选什么为什么 He works as a teacher now,but he ___ on a farm for 3 years.A.worked B.has worked C.had worked D.woHe works as a teacher now,but he ___ on a farm for 3 years.A.worked B.has worked C.had worked D.wokes答案给的是A,但是为什么不能选C过去完 While_______money,he had worked very long hours He in the factory for three years before he joined the Army.A has worked B works C had worked Dwill work He is in China now.He ____ (work)in Africa for 5 years.请问到底填worked还是had worked?rhebok 和 Splendidyuki 说的很有理 He works in China now ,but he __ in Africa for eight years.(worked/had worked)请问后面括号里面应选哪一个?为什么? He works in a factory now, but he _____on a farm for 20 years. A.worked B.had worked为什么答案选了A 而不选B We were not surprised at ( ),for he had worked so hardA：what has he achieved B：what he had achieved请赐教! He said that he had worked all day yesterday.had worked 我用的对吗? 请帮助分析一下这个句子 by 1999 he had worked hard enough for fortune to take over. He______ on the farm for twenty years and now he is a teacher.A.has worked B.had worked C.worked D.works不是有for+一段时间么,为什么不能选b呢 He has already worked for() hour.