Mrs.Black _has been in_China since the summer of 1998,为什么是用has been in而不是用has been to?

Mrs.Black _has been in_China since the summer of 1998,为什么是用has been in而不是用has been to? Mrs.Black 意思快 good a( ),mrs,black ·Mr and Mrs Black have been in China since 1990.同义句改写 Mr and Mrs Black have been in China since 1990.同义句改写 Mrs Black has been here for two years.(同义句） mrs black-------(look)afer her bird carefully The teacher in the__is Mrs Black. Mrs Black likes s____ at the store mrs.black () form the united sates . 填空 mr black is .mrs black is putting ...... His sister has been to Hong Kong twice.划线部分提问twice为划线部分 答语_ _ _has his sister been to Hong Kong Mrs Black is busy today(同义句）Mrs Black ______ _______today. Mrs Green ____ (teach) English in a middle school.She ____ (begin) to teach there in 1993.还有一道 Mr Black ____ China for many years.A.has been to B.has come toC.has been in D.came Mrs Black is Ann's mother.(同义句转换） who is right?mr black or mrs white?. who is right?mr black or mrs white?怎么回答? Mrs.White,and Miss Black are good friends什么意思