Mary has to study ____a math test A.at B.for C.in D.to

Mary has to study ____a math test A.at B.for C.in D.to Where is Mary?He has gone to school.（保持原句意思）Where is Mary?He is__ __ __ __school. Mary has read the English story twice 改为被动语态 The English stroy __ __ __twice i'll try my best to study english well句型转换i'll __ __ __ to study english well judy was sick she has to __ __ __ __ __ (请三天的假) He has promised to surf the Internet to help study,but but each time ends up __ computer games.He has promised to surf the Internet to help study,but but each time ends up __ computer games.Aplay B playing C played D to play选哪个,请帮我 --I have never been to Singapore.-----______.A.so has mary B.mary has too C.mary has,eitherD,neither has mary She has to study English.does she have to study eng 无法理解 .为什么不用has? Mary is so young that she can't go to school 改为Mary isn't __ __ __go to school Can you come over to my house __(study) with me.用to study还是? they can __ much there .A.learn B.study C.to learn D.to study He has been to America.对America提问. __ __ __ he been __? He has many ways to celebrate Halloween.(同义句） He __ Halloween __ __ __ He is looking for a t___ job as English teacher Mary can not go on a trip.She has to study for ...He is looking for a t___ job as English teacherMary can not go on a trip.She has to study for a g____ test Mary has to help her mother b_____ on weekends. he has to study()his final english exam No,he can't.He has to study的翻译 He has received a letter from his parents.He has __ __ his parents.You can hear theHe has received a letter from his parents.He has __ __ his parents.you can't go there but Mary can.__ you __ Mary can go there.