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The main cause of the disease in China is drug abuse, is very serious in Yunnan.

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The main cause of the disease in China is drug abuse, is very serious in Yunnan.

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

试题答案

D

标签：indiseaseischinathe

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