I think I'm going on a vacation this summer.If you ___,you will have a good.A.do B.are为什么不能选B?

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I think I'm going on a vacation this summer.If you ___,you will have a good.A.do B.are为什么不能选B?

I think I'm going on a vacation this summer.If you ___,you will have a good.A.do B.are为什么不能选B?
I think I'm going on a vacation this summer.If you ___,you will have a good.A.do B.are
为什么不能选B?

I think I'm going on a vacation this summer.If you ___,you will have a good.A.do B.are为什么不能选B?
如果是are,那么你就默认成 if you are going on a vacation,you will have a good.
if 引导的时间状语从句就不成立了,本应该是主将从现的.
所以应该选do.即:If you go on vacation.

do 表示对谓语动词的省略,英语中常这样做。可以理解为一种习惯。

do是问关与动作和行动的问题,are是问关与是不是的,前面说的主要是动作going on a vacation