----- I know ,he will stay here for half a year.A、As soon as

C
在表示“就……而论”之意时,例：As far as I know,she will be away from Macao for two months.
据我所知,她将要离开澳门两个月.
As far as my knowledge goes,there is no such word in English.
据我所知,英语里没有这样一个字.