concern 及物动词,使担忧,但为什么还有 be concerned about

concern 及物动词,使担忧,但为什么还有 be concerned about be concerned about concern about concern about 和be concerned about意思相同吗 be concerned about 和 concern about 什么区别? be concerned about和concern about的区别 英语中concern 和 be concerned about 有什么区别? be concerned about ,concern about 不都有担心……的意思吗?为什么省略句中不能用conc be concerned with中concern不是及物动词吗?怎么还要个介词with? concern的用法关心某事是不是sb be concerned with sth那么concern about 最好有 是用be concerned about 还是用concern about:两者有什么区别? be concerned about造句 关于be concerned about