问题描述：
一题简单的英语时态题目
You won't know if it fits until you______ it on.
A.had tried B.are trying
C.have tried D.will try
完成时不是这样用的啊
You won't know if it fits until you______ it on.
A.had tried B.are trying
C.have tried D.will try
完成时不是这样用的啊
问题解答：
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