Canada is the only in which the numbers in * have decreased over the period.
问题描述：
Canada is the only in which the numbers in * have decreased over the period.
请问这种句型要怎么分析,which 前面的in 修饰什么,which又指代什么,请高手帮我理顺,晕死了...哎
答
加拿大是这一时期唯一服刑人数在减少的（国家）
Canada主语
is谓语
the only 表语指代加拿大
in which the numbers in * have decreased 定语从句修饰the only,which指代一个国家在从句中作状语,前加in
over the period.时间状语我不太明白为什么要必须这么说Canada is the only which the numbers in * have decreased over the period . 可以吗，不知道为什么加IN定语从句变成单句为the numbers in * have decreased in Canada in Canada 做地点状语Canada 作介词in的宾语，化为定语从句Canada 用which代替，一般介词一并前置做关联词组，in which 也可用where替换