Medical treatment varies greatly from state to state in this country, ______ is

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问题 Medical treatment varies greatly from state to state in this country, ______ is really confusing to me.

选项 A、this
B、it
C、that
D、which

答案 D

解析该题考查考生对非限制执行定语从句的掌握。which在这里指代逗号前面的那个句子，即这个国家的医疗情况因州而异。

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