Nowadays more and more people are advised to arrange for insurance they or their family members need medical treatment.
A so that B. in order that
C in case D no wonder that
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解析：现在建议越来越多的人买医疗保险以防止他们或家人不时之需。这里的in case意为“免得，以防万一”，引导目的状语从句。so that和in order that一样用法但是不合题意，no wonder that意为“难怪…”不合题意。