China is developing a rural health care service system, I’m sure more residents will benefit.
A. from which
B. of which
C. about that
D. from that
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(答案→)A. from which
B. of which
C. about that
D. from that
解析：考查定语从句。句中benefit from从……获益，故用from which。句意：中国正在发展农村健康服务体系，我相信更多的居民将从中受益。