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

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

选项 A、what
B、who
C、that
D、which

答案D

解析 本题中which引导一个非限制性定语从句修饰drug abuse。
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