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19.Yuan Longping takes up the research on farming for decades and this is ____ he devotes all his life to.(  )
A.whichB.howC.whereD.what

分析 袁隆平从事农业研究有数十年,这是他把自己的一生都奉献于此了.

解答 答案:D
分析句子结构可知,"____ he devotes all his life to"用在了系动词is之后,故本句是表语从句.根据句意可知,该从句缺少宾语补足语,故此处应选连接代词,意为:他把自己的一生都奉献给了农业研究;A.which 哪一个,用在此处不合句意; D.what 可以代指人或事物;故选D

点评 本题考查了连接代词what在表语从句中的用法.做本题时,首先通过分析句子结构,确定该句为表语从句;其次根据句意判断出从句缺少了宾语补足语,故选符合句意的what;另外,在本题中,还应注意总结连接代词what与which的区别.

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