He paid for a seat when he _____ have entered free.(could /would / must / need)请解释

He paid for a seat,when he ----have entered free.A.could B.would C.must D.need He paid for a seat,when he ___ have enter free.A .could B .would C .must D .need he paid for a seat ,however,he ___have entered freeA could B would C must D need 为什么选A He paid for a seat when he _____ have entered free.(could /would / must / need)请解释 He paid for a seat,when he could have entered free.这句话为什么用when when这个词本身在这是啥意思?又是啥用法? 求句型分析 when在这里是怎么用的He paid for a seat,when he could have entered free. 高中英语情态动词填空题He paid for a seat,when he ______ have entered free.（SD05） A.could B.would C.must D.need 填什么?怎么翻译啊? 高中英语中when的疑问David paid for a seat,when he could have entered free.此句应该如何翻译,其中when的用法是什么,该怎么翻译, 题目The man said he ____the bicycle just now A had paid B was paid c was paid for D paid for Everyone has the right___the work he does.A.to pay for B,to pay C.to be paid for D.paid for can you guess_the new Nike sports shoes?yes.maybe he askes his grandpa to pay for them,i think.A how he paid for B where he bought C when he paid for D why he bought 为何选A I paid one dollar for my seat,.not so much as thought it would cost翻译 a doctor needs to be paid enough for what he has he( )3,000 yuan for it.A.spent B.took C.paid D.got He paid a large s_____ of money for the painting by Turner. 20.mike was lucky enough to sell his second-hand car for exactly ________A.what he had paid for it B.what he was paid for it C.how much had he paid for it D.when he had paid for it为什麼是A而不是C? 英语题 小学水平的 只是有点搞而已 要有依据啊!Tom didn't tell me for his new car.a how much had he paid b how much he had paid]c he had paid how much d Although he paid a lot of money for the car,he was even happy to have it.急