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

发布时间：2020-08-16 16:50:06

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：本题考查非限定性定语从句。which指代前面的先行词drug abuse,非限定性定语从句不用that。
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