when did you come here
问题描述：
when did you come here
A: Tow years ago
B: For 2 years
答
选A,when did you come here? 是一个过去式,你什么时候来这儿的?是说你过去的某个时间点来这儿的,回答也要用过去式,two years ago,两年前,完整的回答是I came here two years ago.如果问题是how many years have you...