Chimpanzees in western Africa's Tai forest crack nuts by pla

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Chimpanzees in western Africa's Tai forest crack nuts by placing them on tree roots and striking them with stones,a learned behavior [probablyl unique to chimpanzees in that area].
A.probably unique to
B.probably unique about
C.probably it is unique to
D.that is probably unique with
E.having probably been unique to
请问这个Unique有什么固定搭配吗?我用排除法已经排除了CDE,就是在AB两者之间纠结...

e unique to 特有的,独特的,如：The custom is unique to China.
再问：那么就是说unique about是没有这个固定搭配么??谢谢！
再答：没有，

Chimpanzees in western Africa's Tai forest crack nuts by pla 问两道SAT语法题,1,Chimpanzees in western Africa's Tai forest crack crack the It is no easy job to crack the nuts,but there are Where's Mount Tai(泰山)?---It's in ____. yep in nuts Whoo!She's nuts翻译 Whoo!She's nuts翻译. BE NUTS IN 啥意思 In October,the price of the________to Mount Tai has risen by 英语翻译There's a good reason that peopel take nuts in food boxe In China's western area ,good teachers are ________needed A. egypt is in africa.用africa提问