He paid for a seat,when he ___ have enter free.A .could B .would _英语解答

He paid for a seat,when he ___ have enter free.
A .could B .would C .must D .need

人气：461 ℃　时间：2020-04-20 19:25:46

解答

选择A.
could have done 虚拟语气,译：本可以怎样怎样,但是没怎样怎样.