How long is it ____ we last spent the holiday in the country toge_英语解答

How long is it ____ we last spent the holiday in the country together?
a. since b until c. that
选A.B C错在哪?有什么用法区别?

人气：211 ℃　时间：2019-12-18 03:06:57

解答

A. since
从一个过去的时间点算起
B是从一个将来的时间点算起