_______ on the new definition of a planet in August 2006,Pluto is no longer a planet.A.To be bas
问题描述：
_______ on the new definition of a planet in August 2006,Pluto is no longer a planet.A.To be bas
为什么选第二个答案?
答
Pluto is no longer a planet.冥王星不再是行星.这是句子主体.已经很完整.那么前面就一定是非谓语的分词形式.有个词组,be base on根据,以…为基础；建立在…基础上这里就是basedbased on the new definition of a pl...