He____for three years A)has joined the army B) has been in the army C) has been an army这题为什么选B不选C呢?

1.The old man ____last year.He____for a year.(die)(动词填空)2.Miss Gao left an hour ago.(同义句转换)Miss Gao____ ____ ____ ____an hour ago.3.Her mother has been a Party member for three years.(同义句)Her mother ____the Party three years__ after three year 还是 three year later Is Rick there? No,he____for Beijing three days ago. A.left B.leaves C.has left D.leaving John stopped____a rest(have)a rest because he____for three hours(work)完形填空要说明理由 for year for year three three five year periods He____for three years A)has joined the army B) has been in the army C) has been serving in the arm He____for three years A)has joined the army B) has been in the army C) has been an army这题为什么选B不选C呢? Three year pain 还有esven year itch he died 3 year ago ,that's to say,he____for 3 years.答案是has been dead为什么不是has dead,这也是过去完成时啊 three-year-olds汉语意思 three-year's句式对吗? three year 用什么提问 three-year与three-years的区别是什么? three-year-old 和 three years old 有什么区别 three years old 与 three-year-old 的区别 three -year-old 和 three years old有什么区别? three-year-old 与 three years old区别