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(guó)，引起該疾病的主要原因是藥物濫用，這在云南非常嚴(yán)重．

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

點(diǎn)評(píng) 本題考查了非限定性定語(yǔ)從句中關(guān)系詞的用法；做類(lèi)似的題時(shí)，需要熟練掌握非限定性定語(yǔ)從句的結(jié)構(gòu)特點(diǎn)以及各關(guān)系詞的用法．

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