if you ____ free tomorrow you can go shopping with us.A are B will be C will D are going to be

if you ____ free tomorrow you can go shopping with us.A are B will be C will D are going to be

题目
if you ____ free tomorrow you can go shopping with us.A are B will be C will D are going to be
为什么句中用are?而不用will be ,will,are going to be?
答案
亲,if 从句中一般将来时用一般现在时代替 
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