A which
定语从句，这里which相当于作介词in的宾语
做此类题，要看后面的定语从句少了什么成分
we spent our summer vacation in（the villege）last year.
which指代the villege
定语从句选A 原因如下①从句中已经有介词in 介词必须有自己的宾语，所以缺少关系代词，所以选A ②in that不合理，因为已经有介词③in which介词重复④从句中缺宾语where 做状语的
A....the village means some place,"in which"equals to "where"..and there is "in" at the end of this sentence, so u need to choose A
C
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