If l don't know if l will know anyone at the party this evening.If you ____ anyone,you won't stayfor a long time will you?A.won't know B.don't konw C.know D.will know为什么

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Ifldon''tknowiflwillknowanyoneatthepartythisevening.Ifyou____anyone,youwon''tstayforalongtimewillyou?A

If l don't know if l will know anyone at the party this evening.If you ____ anyone,you won't stayfor a long time will you?A.won't know B.don't konw C.know D.will know为什么
If l don't know if l will know anyone at the party this evening.If you ____ anyone,you won't stay
for a long time will you?A.won't know B.don't konw C.know D.will know
为什么

If l don't know if l will know anyone at the party this evening.If you ____ anyone,you won't stayfor a long time will you?A.won't know B.don't konw C.know D.will know为什么
B,这是条件从句,从句用一般时态

B.don't konw

第二个if是是否的意思,第一个假如 第三个假如
假设在某种情况下 作为条件
但为了区别虚拟语气,一般去掉假设两个字比较好