if it---too much trouble,i'd love a cup of tea.为什么用isn't而不用wasn't?这是关于哪种语法?
问题描述:
if it---too much trouble,i'd love a cup of tea.为什么用isn't而不用wasn't?这是关于哪种语法?
答
if it---too much trouble,i'd love a cup of tea.为什么用isn't而不用wasn't?这是关于哪种语法?