B as,因为不是结果状语从句,而是定语从句,因为work out后面没有宾语it.
如果是As a teacher , I seldom give my students so difficult a problem that they can not work out it 就对了.
B as,因为不是结果状语从句,而是定语从句,因为work out后面没有宾语it.
如果是As a teacher , I seldom give my students so difficult a problem that they can not work out it 就对了.