Don't talk loudly at the meeting .If you __ ,you have to go out.A.do Bdid C.can D.are 为什么选A

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Don''ttalkloudlyatthemeeting.Ifyou__,youhavetogoout.A.doBdidC.canD.are为什么选ADon''ttalkloudlyatthemeetin

Don't talk loudly at the meeting .If you __ ,you have to go out.A.do Bdid C.can D.are 为什么选A
Don't talk loudly at the meeting .If you __ ,you have to go out.A.do Bdid C.can D.are 为什么选A

Don't talk loudly at the meeting .If you __ ,you have to go out.A.do Bdid C.can D.are 为什么选A
Don't talk 是一般现在时的祈使句,和它呼应的是 do,意思等于talk.If you talk loudly,you have to go out.

条件状语从句,如果你要这样做,你要出去。A项的do指代前面说的talk loudly.