If you win the petition, you will be given to Europe for two.
A. a free 7-day trip
B. a free trip for 7-day
C. a 7-day free trip
D. a trip for 7-day free
网友回答
A. a free 7-day trip
B. a free trip for 7-day
C. a 7-day free trip
D. a trip for 7-day free
解析：
“数词+连字符+名词”只能作定语，放在被修饰的名词前，由于free与被修饰对象更紧密一些，因此，只能C项成立。