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:

考查定語(yǔ)從句。which引導(dǎo)一個(gè)非限制性定語(yǔ)從句。原句出自China Daily。

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