how long will he be staying解释具体的结构 be staying 为什么这么用

how long will be ( )will he be back?In three weeks A.How often B.How long C.How soon -( )will he be bick?-In a week.A.How long B.How soon how long will he be staying解释具体的结构 be staying 为什么这么用 ----- will he be back home ,do you know?A How long B How often C How soon D How far —____ will he be back?—In ten days.A.How soon B.How long C.How D.when How long will you be a___ how long will be online是什么意思 你的英语 填did 如果是will,则是这样的,how long will he be staying there ----What time will Mr brown be back to China?----Sorry.I don't know________.A.when did he go abroad B.why he is going abroadC.how soon will he be back D.how long he will stay abroad ----------will he be back 答语是He will be back in two days ,I think.这是一道选择题,选项有：How long ,How soon ,How often ,How much,四选一,选哪个? （2011泉州）How long do you think he will ___?A.begin B.away C.be away D.leave how soon will he be back对吗 How long will he catch a fish 改错 How long will he keeps it?是keeps还是keep I can support how long?Finally I will be crazy? who knows how long it will be lasted Our love will be for how long?我是想问这句是什么意思