问题补充：
It took us quite a long time to get to the amusement park. It was journey.
A. three hour
B. a three-hours
C. a three-hour
D. three hours
答案：
A. three hour
B. a three-hours
(答案→)C. a three-hour
D. three hours
解析：“一次旅行”要说成a journey，three hours中间有连字符时hours 用单数three-hour相当于形容词作用。句意：到达娱乐公园需要相当长时间，这是一个三小时的旅行。
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