I can't find my bag anywhere.I think you _it during the concert so it might be in the music hall.用left还是dropped?为什么?这两个选项有什么区别?急用.

问题描述:

I can't find my bag anywhere.I think you _it during the concert so it might be in the music hall.
用left还是dropped?为什么?这两个选项有什么区别?急用.