twice a year 中twice的词性

twice a year 中twice的词性 twice a year的意思 once half year,twice a year I visit them twice a year.twice划线提问 用一个单词表示twice a year 用一个单词表示twice a year They have an English contest twice a year.对twice a year提问 How often have they been to Italy for a holiday?A Twice B Twice a year 画线句提问We plant trees twice a year.twice 被画线 They have produced ____they did last year.A twice as much grain as B twice more grain asC twice as many grain asD as twice much grain as 简单的英语语法：389 is the number of days in a year (365) added to the number of months twice (24).请问这里的twice在句中充当什么成份?修饰什么的? 英语选择Professor Lee visits China almost __.​ A.twice a yearA.twice a year B.a twice year C.a year twice D.a year two times 389 is the number of days in a year (365) added to the number of months twice (24).这里的months twice 该怎么理解? Twice a week的用法,急... twice a weed的中文意思 Twice a week. Twice times a week. 翻译:Twice a month