一道英语初中的填空题we have never seen him _____(look)so well before 为

一道英语初中的填空题we have never seen him _____(look)so well before 为 I have never seen him look so well before. we 've never seen him looking so well before 这个的为什么要用looking You look so well,I've never seen you ( ) so well before I have never seen _____ film before. Never have I seen him before和Never before have I seen him 是一 never have I seen him before.never before have I seen him .哪 we have never seen ____art festival before 含有一个分词短语I have never seen him before.So I did not recognize You have never seen him,_____ _____.(反意疑问句) you look so well .i 've never seen you ()so well .这里为什么用look 为什么选Never before have we seen each other 而不是选B,它的结构是什么?