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

解析考查定语从句。which引导一个非限制性定语从句。

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小学英语

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