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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 在中国,引起该疾病的主要原因是药物滥用,这在云南非常严重.

解答 答案:D
本句为非限定性的定语从句;此处在句中作主语,指代的是前面句子的内容,应使用关系代词which;A.连接代词,不能用于定语从句中;B.关系代词,在定语从句中作主语或宾语,通常指人;  C.that不能用于非限定性的定语从句中;D.关系代词,在定语从句中作主语或宾语,指物或指代前面句子的内容;故选D.

点评 本题考查了非限定性定语从句中关系词的用法;做类似的题时,需要熟练掌握非限定性定语从句的结构特点以及各关系词的用法.

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