how long have they been dating和how long have they dated?区别?
how long have they been dating和how long have they dated?区别?
known,how long,have they,each other
how long have they 还是用them
"How long have you been
how long have you done与how long have you been的区别
——HOw long have they been watching TV ——For 急i!
How long have they ___?A.been married B.got married
how long have you been in与how long have been to的区别,还有how lon
how long have you been here 和 how long have you stayed here
How long have they built these highrises?(被动语态)
( ) 3.--- How long have they ______ France?--- For about hal
How long have you been skating?与How long did you skate?的区别