the more difficult、 the most difficult、 a most difficult、 a more difficult的区别

题目

the more difficult、 the most difficult、 a most difficult、 a more difficult的区别
It is____question but not the most diffcult one in the examination paper.
A.the more difficult B.the most difficult
C.a most difficult D.a more difficult

答案

答案应该是C吧
more应该只用于比较 是出现对比的时候才用
the most是最高级 the most difficult就是 最难的
a most 相当于very 就是非常的意思