问题
选择题
The main cause of the disease in China is drug abuse, ________is very serious in Yunnan.[ ]
A. what
B. who
C. that
D. which
答案
答案：D
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The main cause of the disease in China is drug abuse, ________is very serious in Yunnan.[ ]
A. what
B. who
C. that
D. which
答案：D