I once_____(have)a dream of being a teacher.

I once_____(have)a dream of being a teacher. Eg:The research is so designed that once_____ nothing can be done to change it.A begins Bhaving begun C begining D begun.Why choose Once_____ oxygen ,the brain dies .A:deprived of B:depriving ofC:having deprived of D:deprived该怎么选呢 还有这里的once怎么理解呢 “I'd like have a ” 11.5 Once_____,everyone taking the examination will be given test papers.Once_____,everyone taking the examination will be given test papers.A.seated B.seating C.being seated D.having seated 为什么不能选C,现在分词做状语,而且sb be seate 英语语法填空有一题Mom is in her seventies,and those hands I once_____(think)to be so rough are stil doing things for me and my family.为什么不能用have thought 而一定要用thought. try I‘d have to a like I d like to have a try I'd like to have a i'd like have a try!改错 i'd like (have)a cake I have a Chinese--English d but i'd like to have a 较真下英语选择题222222222222222222222222222Teachers usually get paid once_____ monthA.a B.the C.an D.不填month不是月份吗,还加冠词是不是得看前边是不是短语啊 we will have a party .i'd like to i I have got______flu .A./ B.the C.an D.a 34.---I have been to Japan. ----___________. A. so have I B.So do I C.Neither have I D.So I have在线等 句子改错：I (A.have been) (B.learning) English (C.since) I (D.have been) ten.