问题描述：
现在完成时的问题,可以用一般过去时回答吗?例：where have you been? i've been to the opera
where have you been? i've been to the opera.
改成 i was to the opera
where have you been? i've been to the opera.
改成 i was to the opera
问题解答：
我来补答展开全文阅读