If the launch(发射)in 2005 is successful，China will be the third country________its astronauts into space after Russia and the U．S．A.sendB.sendsC.sendingD.to send
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D解析分析：英语中名词前面有序数词或类似序数词的the next，the last话，那么后面就可以用动词不定式作定语。(延伸)China will be the third country to send its astronauts into space此处country是send的逻辑主语。