Traveling in England, it will be ______ cheaper if you buy a ret

Traveling in England, it will be ______ cheaper if you buy a return ticket on the train.
A、more
B、very
C、quite
D、even
【正确答案】：D
【题目解析】：cheaper是形容词比较级，四个选项中只有D,even可以修饰，其余三个选项都不能修饰比较级。