Major health systems act as specialized hospitals______patients are referred for sophisticated therapy.
A、
to which
B、
in which
C、
at which
D、
in that
【正确答案】
A
【答案解析】
解析：题干：主要医疗系统有专科医院的功能，病人可通过这些系统获得综合治疗。此处为介词to提前的定语从句。
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