A survey was carried out on the death rate of new-born babies in that region, ______ were surprising.
A、
as results
B、
which results
C、
the results of it
D、
the results of which
【正确答案】
D
【答案解析】
解析：从句子结构分析，逗号后的句子为定语从句。可首先排除A、C两项，因为这两项中没有关系代词。再根据"结果"和"调查"两者的关系，"调查"应是"结果"的定语。
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