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?

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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?

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