题目内容
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
D
解析:
略
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题目内容
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
D
略