If you win the competition you will be given to Europe for two.A. a free 7-day tripB. a

问题补充：

If you win the competition, 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

答案：

A. a free 7-day trip

B. a free trip for 7-day

(答案→)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。