问题描述:
We won't attend the meeting if they don't ask us.
We don't attend the meeting unless they ask us.(将if not改成unless)
won't为什么变成了don't了?
We don't attend the meeting unless they ask us.(将if not改成unless)
won't为什么变成了don't了?
问题解答:
我来补答展开全文阅读