[单选题]A survey was recently carried out on the reasons why some people took drugs,()were shocking. 

A

which results 

B

its results

C

the results of which

D

the results of it

正确答案:C
题目解析

由题干可知,逗号后面的是定语从句来修饰前面的句子,从句中缺少的是主语,四个选项中只有C符合题意,所以选C。句意:最近对一些人服用药物的原因进行了调查,结果令人震惊。

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