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17．The main cause of the disease in China is drug abuse，________is very serious in Yunnan．（　�。�
A．whatB．whoC．thatD．which

分析 在中國，引起該疾病的主要原因是藥物濫用，這在云南非常嚴重．

解答 答案：D
本句為非限定性的定語從句；此處在句中作主語，指代的是前面句子的內容，應使用關系代詞which；A．連接代詞，不能用于定語從句中；B．關系代詞，在定語從句中作主語或賓語，通常指人；  C．that不能用于非限定性的定語從句中；D．關系代詞，在定語從句中作主語或賓語，指物或指代前面句子的內容；故選D．

點評 本題考查了非限定性定語從句中關系詞的用法；做類似的題時，需要熟練掌握非限定性定語從句的結構特點以及各關系詞的用法．

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