Which floor does he live on?live后面为什么要加介词on Where does he live?后面为什么没有介词
问题描述:
Which floor does he live on?live后面为什么要加介词on Where does he live?后面为什么没有介词
答
Which floor does he live on?live后面为什么要加介词on Where does he live?后面为什么没有介词