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

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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
解析