This maths problem is rather difficult,but it is not _____ the students.

问题描述:

This maths problem is rather difficult,but it is not _____ the students.
A) over
B) beyond
C) above
D) within

This maths problem is rather difficult,but it is not _____ the students.
A) over
B) beyond
C) above
D) within
选B解释为超过...的能力
其它选项都没有这层意思