be concentrate on.be peroccupied with .focus on.都一样吗.

be agree to do的反义词是be for doing么?英语.concentrate on+?be against+? be concentrate on.be peroccupied with .focus on.都一样吗. be absorbed in与be concentrate on在用法上的区别是什么? be absorbed in与be concentrate on在用法上的区别是什么? 用be familiar tocentre on/uponconcentrate on 造句．这3个短语各造一个,谢谢! You should ___ more __ your work than playing.A.concentrate ,onB.be,concentrated,onC.concentrate,forD.concentrate,to be delighted that,take sb with sth,be enger to do,concentrate on,inform sb of sth, 造句各造一个 be afraid to 和be terrified of 有什么区别顺便问下pay attention to 和concentrate on有什么区别 be on be on With his attention ( ) on the film,the boy didn't notice his father leaving quietly.A.concentrating B.concentrated C.to concentrate D.to be concentrated concentrate on等于 concentrate on的用法 i concentrate on 选择恰当的词组并用其正确形式填空 stay up,concentrate on,be选择恰当的词组并用其正确形式填空stay up,concentrate on,be good for,in fact,look good on,instead of,the other day,learn fro according ot he directions on a can of frozen orange juice concentrate,1 can of concentrate is to be mixed with 3cans of water to make orange juice.How many 12-ounce cans of the concentrate are required to prepare 2006-ounce servings of arange juicea 参考词汇：study hard ,relax,happy,be careful ,grades,confident,come true ,concentrate on...参考词汇：study hard ,relax,happy,be careful ,grades,confident,come true ,concentrate on,开头已给：Dear Li Lei i am sorry to hear that you don't 达人进She can't concentrate herself on her research work with so many letters ________ A.to answer B.to be answeredC.being answeredD.to be answering详解,谢