I don't think ( )possible for us to finish work in such a short time.A this B that C its D it
答案：D
it 作形式宾语,后面的动词不定式结构作真正的宾语,其实答案it's 也对,但是its就错误了.谢谢你。以后如有不懂的，请不要嫌劳赐教。嗯，记得采纳你 的提问。