1.it is taken as a sign of的用法和结构成分类似于,it is regarded/considered as “把..当作”2.为什么fulfill是原型而不是动名词形式,是因为fulfill和solve并列3.with speed 作状语修饰being competent to solve ...恩，明白了being competent to 后面跟了两个动词一个是solve a problem另一个是fulfill a job successfully。也就是说fulfill a job successfully也是跟在不定式的后面的地位和solve并列，所以用原型