it will be -if you buy a return ticket on the train when you travel in england为什么选CA much cheap B more cheaply C much cheaper
问题描述：
it will be -if you buy a return ticket on the train when you travel in england为什么选C
A much cheap B more cheaply C much cheaper
答
cheap有比较级形式可以直接加er
只有much可以修饰比较级