You won't know if the coat fits you until you ___ it on.

问题描述:

You won't know if the coat fits you until you ___ it on.
A. will try
B. are trying
C. tried
D. have tried
为什么?

D
have +done 现在完成时表示做的动作对后面产生了影响
就是只有穿上才知道和不合适,这里有个时间次序,所以应该用现在完成时