问题
选择题
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
答案
答案：D
考查定语从句。which引导一个非限制性定语从句。原句出自China Daily。
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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
答案：D
考查定语从句。which引导一个非限制性定语从句。原句出自China Daily。