how long have you been studying为什么后面要加ing我可以说i have been studied since ...为什么?那应该怎么写?想题目上的问句是问说你到目前为止学了多久的英文还是问你学了多久的英文（已经学好）那we

how long have you be in here怎么回答 How long have you been how long were you in japan how long have you been in japan?how long will you be in janpan?分别 How long was it be,since i held you near?How long will it be,till i have you right here?小弟英语不好, how long have you been learning english? How long have you been studying? How long have you been in China? how long have you been dancing today? how long have you studied in this How long have you been there? How long have you live in China How long have you ----(live)here? “How long have you been watching How long will you be a___ how long have you been up?How long have you___up?A.got B.get C.been D.be这里为什么不选A? how long have you done与how long have you been的区别 How long have you been skating?与How long did you skate?的区别 How Long have you felt thisHow Long have you felt this way?翻译成汉语