第一空很显然根据 this ancient creature 应该选a,指代关系.第二空unlike earlier birds and unlike reptilian ancestors修饰的是this ancient creature,而it指代的内容也是this ancient creature；即这只鸟和更早些的鸟类及爬行类动物的祖先不同,它是没有牙齿的.即:最近发现这只鸟=现在的鸟=没有牙齿 最近发现的鸟之前的鸟=爬行类祖先=有牙齿所以空格处只能填e(预示)才合理.f意思恰恰相反(最近发现的鸟=之前的鸟=爬行类祖先=有牙齿)突然发现把简单的东西说复杂了?
请教绿皮里的一道双空题.the skeleton of_bird that was recently discovere
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