The main cause of HIV / AIDS infection in China is drug abuse, is very serious in Yunnan

发布时间：2020-08-17 14:43:36

The main cause of HIV / AIDS infection in China is drug abuse,       is very serious in Yunnan.
A. what
B. who
C. that
D. which

网友回答

A. what
B. who
C. that
(答案→)D. which
解析： 考查定语从句。which引导一个非限制性定语从句。原句出自China Daily。
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